Holidays and Observances
Alphabetical Listing of I Holidays

Below, you can find a Holidays and Observances Alphabetical Listing of US Holidays, World Holidays and Observances that start with the letter I.  We will add any new Holidays as we find them!

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I

• I Am a Mentor Day - January 6, 2026

• I Forgot Day - July 2

• I Heart Horror Day - February 4

• I Love Cowboys and Cowgirls Day - August 15

• I Love Horses Day - July 15

• I Love Lucy Day - October 15

• I Love My Dentist Day - June 2

• I Love Reese's Day - May 18

• I Love to Write Day - November 15

• I Love Yarn Day - October 10, 2026 (Second Saturday in October)

• I Need a Patch for that Day - May 21

• I Want to Start my Own Business Day - September 11

• I Want You to be Happy Day - March 3

• IBM PC Day - August 12

• Ice Cream Day - December 13

• Ice Cream for Breakfast Day - February 7, 2026 (First Saturday in February)

• Idaho Human Rights Day - January 19, 2026 (State Holiday in Idaho on the Third Monday in January)

• Idaho State Holidays

• Ides of March - March 15
  

• Idiopathic Intracranial Hypertension Awareness Month - September

• Iditarod Race - March 7-22, 2026 (Starts First Saturday in March)

• IEEE Global Engineering the Future Day - May 13

• If Pets had Thumbs Day - March 3
  

• Illinois State Holidays 

• I'm Just Me Because Month - October

• I'm Not Going to Take It Anymore Day - January 7

• I'm on Top of it Day - September 14, 2026 (Second Monday in September)

• Imbolic - February 2 (Pagan)

• Impersonate Authority Day - June 3

• Impossible Astronaut Day - April 23

• Improve Your Home Office Week - October 11-17, 2026 (Second Full Week of October)

• Improve Your Office Day - October 4

• In God We Trust Day - April 22

• Inauguration Day - January 20 (State Holiday - DC, LA, MO, VA)

• Inbox Zero Day - October 6

• Income Tax Pay Day - April 15, 2026

• Inconvenience Yourself Day - February 25, 2026 (Fourth Wednesday in February)

• Incredible Kid Day - March 19, 2026 (Third Thursday in March)
  

• Independence Day (Fourth of July) - July 4

• Independence Day Observed - July 4, 2026

• Independence From Meat Day - July 4

• Independent Bookstore Day - April 25, 2026 (Last Saturday in April)

• Independent Retailer Month - July

• India Pale Ale Beer Day - August 6, 2026 (First Thursday in August)

• Indiana Flower and Patio Show - March 14-22, 2026

• Indiana State Holidays

• Indianapolis 500 - May 24, 2026 (Sunday of Memorial Day Weekend)

• Indigenous People's Day - October 12, 2026 (State Holiday in AK, CA, MN, NM, VT, WA, WI)

• Individual Rights Day - August 29

• Indivisible Day - July 4

• Industrial Workers of the World Day - June 27

• Infection Control Week - October 19-25, 2026 (Third Week of October)

• Information Overload Day - October 20, 2026 (Third Wednesday in October)

• Informed Woman Month - April
  

• Ingersoll Day - August 11

• Innergize Day - September 24, 2026 (Day after the Autumn Equinox which falls on September 22, 2026)

• Innovation Day - February 16

• Inspire Your Heart with Art Day - January 31

• Insurance Awareness Day - June 28

• Insurance Nerd Day - July 18

• Inter-American Water Day - October 3, 2026 (First Saturday in October)

• Intergalactic Star Wars Day - May 4

• Intergeneration Day - October 4, 2026 (First Sunday in October)

• Intergeneration Month - September

• International Accounting Day - November 10

• International Adjust Your Chair Day - October 19, 2026 (Third Monday in October)

• International African Diaspora Day - October 4, 2026 (First Sunday in October)

• International African Penguin Awareness Day - October 10, 2026 (Second Saturday in October)

• International AIDS Awareness Month - December

• International Air Ambulance Week - September 7-13, 2026

• International Albarino Days - August 1, 2026

• International Albinism Awareness Day - June 13

• International Alopecia Month For Women - July

• International Amateur Radio Day - April 19

• International Amateur Radio Month - April

• International Angelman Day - February 15
  

• International Animal Rights Day - December 10

• International Animation Day - October 28

• International Answer the Telephone Like Buddy the Elf Day - December 18

• International Anti-Corruption Day - December 9

• International Artists Day - October 25

• International Asexuality Day - April 6

• International Ask a Question Day - March 14
  

• International ASMR Day (Autonomous Sensory Meridian Response) - April 9

• International Assistance Dog Week - August 2-8, 2026 (Starts on First Sunday in August)

• International Asteroid Day - June 30, 2026

• International Astrology Day - March 20, 2026 (usually either March 20 or March 21 - falls on the same day as the Northward Equinox -(Spring equinox in the Northern hemisphere, Fall equinox in the Southern hemisphere).

• International Augmentative & Alternative Communication (AAC) - October

• International Aura Awareness Day - November 28, 2026 (Fourth Saturday in November)

• International Awareness Day - May 12

• International Baby Lost Mother's Day - May 3, 2026 (First Sunday in May)

• International Bacon Day - September 5, 2026 (Saturday before Labor Day which falls on September 7, 2026)

• International Bagpipe Day - March 10

• International Banana Festival - September 21
  

• International Bandanna Day - October 30, 2026 (Last Friday in October)

• International Bat Appreciation Day - April 17

• International Bat Night(s) - August 29-30, 2026 (Last Full Weekend in August)

• International Bath Day - June 14

• International Beaver Day - April 7

• International Beer and Pizza Day - October 9

• International Beer Day - August 7, 2026 (First Friday in August)

• International Bereaved Mothers Day - May 3, 2026 (First Sunday in May)

• International Biodiesel Day - August 10

• International Blessings of the Fishing Fleet Day - October 4, 2026 (First Sunday in October)

• International Blondie and Deborah Harry Month - July
  

• International Body Piercing Day - June 28

• International Book Giving Day - February 14

• International Boost Self Esteem Month - February

• International Bow Day - August 19

• International Brain Awareness Week - March 16-22, 2026

• International Brain Teaser Month - January
  

• International Building Safety Week - May 3-9, 2026 (First Full Week in May)

• International Business Image Improvement Month - May

• International Buy a Priest a Beer Day - September 9

• International Cabernet Sauvignon Day - August 30

• International Cachaca Day - June 12

• International Cake Day - July 20

• International Can-It Forward Day - August 1 (Mason Jars)

• International Carrot Cake - April 4

• International Cassette Store Day - October 20

• International Cat Day - August 8

• International Celebrate Bi Sexuality Day - September 23

• International Change Your Stars Month - January
  

• International Cheetah Day - December 4

• International Chef's Day - October 20

• International Chernobyl Disaster Remembrance Day - April 26

• International Cherry Pit Spitting Day - July 4, 2026 (First Saturday in July)

• International Chess Day - July 20

• International Chicken Wing Day - July 1

• International Child-Centered Divorce Awareness Month - January

• International Child Helpline Day - May 17

• International Childfree Day - August 1

• International Childhood Cancer Awareness Day - February 15
  

• International Childhood Cancer Awareness Month - June
  

• International Children's Book Day - April 2
  

• International Children's Day - June 1

• International Chocolate Day - September 13

• International Choreographers Day - January 9

• International Circus Festival of Monte Carlo - January 16-25, 2026 (Monaco)

• International Civil Aviation Day - December 7

• International Civility Awareness Month - May

• International Clash Day - February 5, 2026

• International Clean Hands Week - September 20-26, 2026 (Third Full Week of September)

• International Cli-Fi Day - April 20

• International Clients Day - March 19

• International Clinical Trials Day - May 20

• International Clitoris Awareness Week - May 3-9, 2026 (First Full Week in May)

• International Clothesline Week - June 6-13, 2026 (starts on the first Saturday in June

• International Clown Week - August 1-7

• International Coaching Week - May 11-17, 2026

• International Coastal Cleanup Day - September 19, 2026 (Third Saturday)
  

• International Coelenterate Biology Week - (2026 TBD)

• International Coffee Day - September 29

• International Color Day - March 21

• International Computer Security Day - November 30
  

• International Condom Day - February 13

• International Conscientious Objector Day - May 15

• International COPD Awareness Month - November
  

• International Country Music Day - September 17

• International Coworking Day - August 9

• International Creativity and Innovation Day - April 13

• International Creativity Month - January
  

• International Credit Union Day - October 15, 2026 (Third Thursday in October)

• International Credit Union Week - October 11-17, 2026 (Week of International Credit Union Day)

• International Creepy Boston Dynamics Robotic Horse Day - September 10

• International Customer Loyalty Month - April

• International Customs Day - January 26

• International Dalek Remembrance Day - December 21

• International Dance Day - April 29

• International Dark Sky Week - April 13-20, 2026

• International Day against DRM (Digital Rights Management) - July 17, 2026

• International Day Against Drug Abuse & Illicit Trafficking - June 26

• International Day Against Homophobia and Transphobia - May 17

• International Day Against Intolerance, Discrimination and Violence based on Musical Preferences, Lifestyle and Dress Code - August 24

• International Day Against Nuclear Tests - August 29
  

• International Day Against Police Brutality - March 15

• International Day Against the Use of Child Soldiers (also known as Red Hand Day) - February 12

• International Day for Achievers - March 24

• International Day for Biological Diversity - May 22

• International Day for Disaster Reduction - October 13
  

• International Day for Failure - October 13

• International Day for Mine Awareness and Assistance in Mine Action - April 4

• International Day for Monuments and Sites - April 18

• International Day for Natural Disaster Reduction - October 14, 2026 (Second Wednesday in October)

• International Day for Preventing the Exploitation of the Environment in War and Armed Conflict - November 6
  

• International Day for Street Children - April 12

• International Day for the Abolition of Slavery - December 2

• International Day for the Elimination of Racial Discrimination - March 21

• International Day for the Elimination of Sexual Violence in Conflict - June 19

• International Day for the Elimination of Violence Against Women - November 25
  

• International Day for the Eradication of Poverty - October 17
  

• International Day for the Preservation of the Ozone Layer - September 16

• International Day for the Remembrance of the Slave Trade & its Abolition - August 23

• International Day for the Right to the Truth Concerning Gross Human Rights Violations and for the Dignity of Victims - March 24
  

• International Day for the Total Elimination of Nuclear Weapons - September 26

• International Day for Tolerance - November 16

• International Day of Acceptance - January 20

• International Day of Action Against Canadian Seal Slaughter - March 15

• International Day of Action for Elephants in Zoos - June 8
  

• International Day of Action for Rivers - March 14

• International Day of Black Women in the Arts - February 1 (First Day of Black History Month)

• International Day of Charity - September 5
  

• International Day of Commemoration and Dignity of the Victims of the Crime of Genocide and the Prevention of this Crime - December 9

• International Day of Commemoration in Memory of the Victims of the Holocaust - January 27

• International Day of Conscience - April 5

• International Day of Cooperatives - July 4, 2026 (First Saturday in July)

• International Day of Democracy - September 15
  

• International Day of Education - January 24

• International Day of Families - May 15

• International Day of Family Remittances - June 16

• International Day of Forests and the Tree - March 21

• International Day of Friendship - July 30
  

• International Day of Happiness - March 20

• International Day of Human Fraternity - February 4

• International Day of Human Space flight - April 12

• International Day of Innocent Children Victims of Aggression - June 4

• International Day of Listening - September 17, 2026

• International Day of Mathematics - March 14

• International Day of Medical Transporters - August 20

• International Day of No Prostitution - October 5

• International Day of Non-Violence - October 2
  

• International Day of Nowruz - March 21

• International Day of Neutrality - December 12

• International Day of Older Persons - October 1

• International Day of Peace - September 21

• International Day of Persons with Disabilities - December 3
  

• International Day of Pink - April 8, 2026 (Second Wednesday in April)

• International Day of Prayer for the Persecuted Church - November 1, 2026 (Usually Second Sunday in November)

• International Day of Radiant Peace - September 22

• International Day of Remembrance and Tribute to the Victims of Terrorism - August 21

• International Day of Remembrance of the Victims of Slavery and the Transatlantic Slave Trade - March 25

• International Day of Rural Women - October 15
  

• International Day of Sign Language - September 23

• International Day of Solidarity with Detained and Missing Staff Members - March 25

• International Day of Solidarity with the Palestinian People - November 29
  

• International Day of Sport for Development and Peace - April 6

• International Day of the African Child - June 16

• International Day of the Deaf - September 27, 2026 (Last Sunday in September)

• International Day of the Girl Child - October 11
  

• International Day of the Nacho - October 21

• International Day of the Seal - March 22

• International Day of the Unborn Child - March 25

• International Day of the Victims of Enforced Disappearances - August 30
  

• International Day of the World's Indigenous People - August 9

• International Day of United Nations Peacekeepers - May 29
  

• International Day of Veterinary Medicine - December 9

• International Day of Women & Girls in Science - February 11

• International Day of Yoga - June 21

• International Day of Zero Tolerance to Female Genital Mutilation - February 6

• International Day to Combat Islamophobia - March 15

• International Day to End Impunity for Crimes Against Journalists - November 2

• International Day to End Obstetric Fistula - May 23

• International Day to End Violence Against Sex Workers - December 17

• International Deaf Awareness Week - September 20-26, 2026 (Last Whole Week in September from Sunday - Saturday)

• International Defense Transportation Day - May 15, 2026 (Third Friday in May)

• International DIS Awareness Month - December

• International Dog Biscuit Appreciation Day - February 23

• International Doodle Dog Day - May 2, 2026 (First Saturday in May)

• International Dot Day - September 15

• International Drive Your Studebaker Day - September 12, 2026 (Second Saturday in September)

• International Drone Day - May 2, 2026 (First Saturday in May)

• International Drum Month - May

• International Dylan Thomas Day - May 14

• International Dyslexia Association Reading Week - November 12-14, 2026

• International Ear Care Day - March 3

• International Earth Day - March 20, 2026 (Same Day as Spring Equinox)
  

• International Eat an Animal for PETA Day - March 15

• International Eat an Apple Day - September 19, 2026 (Third Saturday in September)

• International Energy Week - February 10-12, 2026

• International Enthusiasm Week - September 1-7

• International Epilepsy Day - February 9, 2026 (Second Monday in February)

• International Essential Oils Day - July 11

• International Expect Success Month - February

• International Face & Body Art Day - February 1

• International Fairy Day - June 24

• International Falafel Day - June 12, 2026

• International Fanny Pack Day - March 14, 2026 (Second Saturday in March)

• International Fact Checking Day - April 2

• International Female Ride Day (IFRD) - May 4
  
  
• International Feng Shui Awareness Day - April 8

• International Festival of Owls - March 6-8, 2026 (First Full Weekend in March)

• International Fetish Day - January 16, 2026 (Third Friday in January)

• International Financial Independence Awareness Day - April 25

• International Firefighter's Day - May 4

• International Firewalk Day - April 4, 2026 (First Saturday in April)

• International Firgun Day - July 17

• International Flirting Week - February 8-14, 2026 (Week of Valentines Day)

• International FND Awareness Day (FND = Functional Neurological Disorder) - April 13

• International Folding Laundry Day - March 30

• International Forgiveness Day - August 2, 2026 (First Sunday in August)

• International Francophonie Day - March 20

• International Fraud Awareness Week - November 15-21, 2026 (Third Week in November)

• International Friendship Day - July 30

• International Friendship Month - February

• International Friendship Week - (2026 TBD)

• International Frozen Yogurt Day - February 6

• International Fun at Work Day - April 1, 2026 (April 1st, unless it falls on weekend, then the first Thursday in April)

• International Games Day - November 21, 2026 (Third Saturday in November)

• International Games Month - November

• International Geocaching Day - August 15, 2026 (Third Saturday of August)

• International Gin and Tonic Day - October 19

• International Girls Day - November 14

• International Girls in Information and Telecommunication Technologies Day - April 23, 2026 (Fourth Thursday in April)

• International GM's Day - March 4 (GM = Game Masters)

• International Golden Retriever Day - February 3

• International Goof Off Week - March 15-21, 2026 (Third Full Week of March)

• International Grenache Day - September 18, 2026 (Third Full Week of March)

• International Group B Strep Awareness Month - July

• International Guide Dog Day - April 29, 2026 (Last Wednesday in April)

• International Guinness World Records Day - November 12, 2026 (Thursday of Second Full Week in November)

• International Guitar Month - April

• International Hamburger Day - May 28

• International Hangover Day - August 8, 2026 (Day after International Beer Day)

• International Happy Gose Day - November 17

• International Hat Day - November 25

• International Hemp Day - April 21

• International Heritage Breeds Day - May 23, 2026 (Saturday of Third Full Week)

• International Heritage Breeds Week - May 17-23, 2026 (Third Week of May)

• International Homeless Animals Day -  August 15, 2026 (Third Saturday of August)

• International Hoof Care Month - February

• International Hoof Care Week - February 3-6, 2026

• International Hot Air Balloon Week - January 25-31, 2026 (Fourth Full Week of January)
  

• International Hot & Spicy Food Day - January 16

• International Housekeepers Week - September 13-19, 2026 (Second Full Week of September)

• International Hug a Medievalist Day - March 31

• International Hug Your Cat Day - June 4
  

• International Human Solidarity Day - December 20
  

• International Hummus Day - May 13

• International Hyena Day - April 27 

• International Ideas Month - March

• International Image Consultant Day - November 23

• International Independent Video Store Day - October 17, 2026 (Third Saturday in October)

• International Infection Prevention Week - October 19-25, 2026

• International Internal Audit Awareness Month - May
  

• International Internet Day - October 29

• International Interpreters and Translators Week - September 20-26, 2026 (Last Full Week in September

• International Inuit Day - November 7

• International Jazz Day - April 30 as well as May 23, 2026 (Saturday of Memorial Day Weekend)

• International Jewish Book Day - December 15, 2026 (5th of Tevet in Hebrew Calendar) 

• International Joke Day - July 1

• International Juggler's Day - April 18

• International Kangaroo Care Awareness Day - May 15

• International Kids Yoga Day - April 3, 2026 (First Friday in April)

• International Kissing Day or World Kiss Day - July 6

• International Kite Day - January 14

• International Lace Day - September 26, 2026 (Last Saturday in September)

• International Lace Week - July 19-24, 2026

• International Lefthander's Day - August 13

• International Lego Day - January 28

• International Lesbian Day - October 8

• International Lightning Safety Day - June 28, 2026

• International Listening Association Week - September 16-19, 2026

• International Listening Awareness Month - March
  

• International Literacy Day - September 8

• International "Louie Louie" Day - April 11

• International Magic Week - October 25-31

• International Makeup Day - September 10

• International Marconi Day - April 25, 2026 (Closest Saturday to April 25th)

• International Mariachi Week - April 29 - May 3, 2026

• International Mathematicians Week - August 1-9

• International MCS Awareness Day - May 12

• International Men's Day - November 19

• International Men's Makeup Day - November 1

• International Men's Month - June
  

• International Mentoring Day - January 17

• International Merlot Day - November 7

• International Midwives Day - May 5

• International Migrants Day - December 18

• International Migratory Bird Day - May 9, 2026 (Second Saturday in May)
  

• International Mind-Body Wellness Day - January 3

• International Mirth Month - March

• International Mobile Phone Recycling Day - January 24

• International Moment of Frustration Scream Day - October 12

• International Moment of Laughter Day - April 14

• International Month of Black Women in the Arts - February

• International Mother Earth Day - April 22
  

• International Mother Language Day - February 21

• International Mountain Day - December 11
  

• International MPS Awareness Day - May 15

• International Museum Day - May 18

• International Music Day - October 1

• International Myalgic Encephalomyelitis / Chronic Fatigue Syndrome Awareness Day - May 12

• International Natural Day - February 13

• International Necktie Day - October 18

• International Networking Week - February 1-7, 2026 (Monday - Friday of First Full Week in February)

• International New Year's Resolution Month for Business - January

• International Newspaper Carrier Day - October 10, 2026 (Saturday of the First Full Week of October)

• International Nikola Tesla Day - July 10

• International No Diet Day - May 6
  

• International Noise Awareness Day - April 29

• International Nude Day - July 14

• International Nurses Day - May 12

• International Open Data Day - March 7, 2026 (First Saturday in March)

• International Orangutan Day - August 19

• International Overdose Awareness Day - August 31

• International Pancake Day - February 17, 2026 (47 Days Before Easter)

• International Panic Day - June 18

• International Pathology Day - November 11, 2026 (Second Wednesday in November)

• International People Skills Month - September
  

• International Permaculture Day - May 3, 2026 (First Sunday in May)

• International Petroleum Week - (Now Known as International Energy Week)

• International Phace Syndrome Awareness Week - March 22-28, 2026 (Last Week of March)

• International Pickle Day- May 16

• International Pickles Week - May 17-23, 2026, (Third Week in May)

• International Picnic Day - June 18

• International Pillow Fight Day - April 4, 2026 (First Saturday in April)
  

• International Pisco Sour Day - February 7, 2026 (First Saturday in February)

• International Pixel-Stained Technopeasant Day - April 23

• International Pizza Cake Day - April 16, 2026 (Third Thursday in April)

• International Plain Language Day - October 13

• International Plastic Bag Free Day - July 3

• International Playdate Day - January 21

• International Podcast Day - September 30

• International Polar Bear Day - February 27
  

• International Pooper Scooper Week - April 1-7

• International Post Card Week - October 4-10, 2026 (First Full Week of October)

• International Prenatal Infection Prevention Month - February
  

• International Print Day - October 21, 2026 (Fourth Wednesday in October)

• International Printing Week - January 11-17, 2026, (Third Week of January)

• International Programmer's Day - January 7 and also on September 13, 2026 (September 13 or on September 12 in Leap Years)
  

• International Project Management Day - November 5, 2026 (First Thursday in November)

• International Quality of Life Month - January
  

• International Rabbit Day - September 26, 2026 (Fourth Saturday or Sunday in September)

• International Raccoon Appreciation Day - October 1

• International Ragweed Day - June 27, 2026 (Fourth Saturday in June)

• International Raw Milk Cheese Appreciation Day - April 18, 2026 (Third Saturday in April)

• International Read an eBook Day - September 18

• International Read Comics in Public Day - August 28

• International Red Panda Day - September 19, 2026 (Third Saturday in September)

• International Reggae Day - July 1

• International Repair Day - October 17, 2026, (Third Saturday in October)

• International Repetitive Strain Injury Awareness Day - February 28

• International Rescue Cat Awareness Month - March

• International Rescue Cat Day - March 2

• International Respect for Chickens Day - May 4

• International Respect for Chickens Month - May

• International Restorative Justice Week - November 15-21, 2026 (Third Week of November)

• International Right to Know Day - September 28

• International Rock Day - July 13

• International Roma Day - April 8

• International Romani Day - April 8

• International Rose' Day - June 26, 2026 (Wine!!) (Fourth Friday in June)

• International Safety Pin Day - April 10

• International Sandsculpting Championship - September 25 - October 4, 2026 (Virginia Beach)

• International Scented Candle - November 1

• International School Meals Day - March 12, 2026

• International Scrapbooking Industry Day - March 4

• International Sculpture Day - April 25, 2026 (Last Saturday in April)

• International Scurvy Awareness Day - May 2

• International Self-Awareness Month - September 
  

• International Self Care Day - July 24

• International Selfie Day - November 14

• International Sex Workers Day - June 2

• International ShakeOut Day - October 15, 2026 (Third Thursday in October)

• International Shareware Day - December 12, 2026 (Second Saturday in December)

• International Ship in a Bottle Day - October 4

• International Sister Cities Day - July 15, 2026

• International Sloth Day - October 20

• International Snailpapers Day - April 7

• International Snow Sculpture Championships - January 24 - February 3, 2026

• International Snowmobile Safety and Awareness Week - January 10-18, 2026

• International Space Day - May 1, 2026 (First Friday in May)

• International Speak Out Month - September

• International Special Librarian's Day - April 13

• International Spirit of the Game Day - December 3

• International Sports Car Racing Day - March 21, 2026, (Third Saturday in March)

• International Square Dancing Month - September

• International Stage Management Day - October 10

• International Stand Up to Bullying Day - February 27, 2026 and November 20, 2026 (Last Friday in February and Third Friday in November)

• International Starman Month - October
  

• International Stout Day - November 5, 2026 (First Thursday in November)

• International Strange Music Day - August 24

• International Strategic Planning Month - October

• International Strategic Thinking Month - September

• International Stress Awareness Day - November 4, 2026 (First Wednesday in November)

• International Stress Awareness Week - November 1-7, 2026 (First Full Week of November)

• International Students Day - November 17

• International Stuttering Awareness Day - October 22

• International Sudoku Day - September 9

• International Suit Up Day - October 13
  

• International Sunflower Guerilla Gardening Day - May 1

• International Surf Music Month - June

• International Surfing Day - June 20, 2026 (First Day in Summer)

• International Survivors of Suicide Day - November 21, 2026 (Saturday Before Thanksgiving)
  

• International Sushi Day - June 18

• International Sweater Vestival - December 4, 2026 (Second Friday after Thanksgiving)

• International Sweatpants Day - January 21

• International Sword Swallowers Day - February 28, 2026 (Last Saturday in February)

• International Systems Engineer Day - November 27, 2026 (Last Friday in November)

• International T-Shirt Day - June 21

• International Table Top Day - April 25, 2026 (Last Saturday in April)

• International Talk Like William Shatner Day - March 22

• International Tatting Day - April 1
  

• International Tea Day - May 21 and December 15

• International Teach Music Week - March 16-22, 2026 (Seven Days Starting on the Third Monday in March)

• International Tempranillo Day - November 12, 2026 (Second Thursday in November)

• International Thank-You Day - January 11

• International Tiara Day - May 24

• International Tiger Day - July 29

• International Tongue Twister Day - November 8, 2026, (Second Sunday in November)
  

• International Toot Your Flute Day - October 4

• International Top Spinning Day - October 14, 2026 (Second Wednesday in October)

• International Town Criers Day - July 13, 2026 (Second Monday in July)

• International Traffic Light Day - August 5

• International Transgender Day of Visibility - March 31

• International Translation Day - September 30

• International Tree Climbing Week - October 9-11, 2026

• International Tripawd Awareness Day - March 3

• International Trombone Week - April 12-19, 2026

• International Tug-of-War Day - February 19

• International Turtle Day - May 23
  

• International Twit Award Month - April

• International Typing Day - October 8

• International Underlings Day - February 29 (Every 4 Years - 2020, 2024, 2028 etc)

• International Victorious Woman Month - May

• International Virtual Assistants Day - May 15, 2026 (Third Friday in May)

• International Vlogging Day - August 10

• International Volunteer Day for Economic and Social Development - December 5
  

• International Volunteers Day - December 5

• International Vulture Awareness Day - September 5, 2026 (First Saturday in September)

• International Waffle Day - March 25

• International Walk to School Day - Now named Walk & Roll to School Day

• International Walk to School Month - October

• International Wayfinding Month - January

• International Wealth Mentality Month - January

• International Week of Black Women In the Arts - February 7-15

• International Week of Prayer for Christian Unity - January 18-25

• International Week of Science and Peace - November 8-14, 2026 (The Week in Which November 11 Falls)

• International Week of the Deaf - September 20-26, 2026 (Last Week that includes Last Sunday of September)

• International Whale Shark Day - August 30

• International Whisk(e)y Day - August 31

• International Widow's Day - June 23
  

• International Wildlife Film Week - April 18-23, 2026 Virtual Event May 1-7, 2022

• International Winter Bike to Work Day - February 13, 2026 (Second Friday in February)

• International Women of Color Day - March 1

• International Women with Alopecia Month - July
  

• International Women's Collaboration Brew Day - March 8 (Same Day as International Women's Day)

• International Women's Day - March 8

• International Women's Day for Peace and Disarmament - May 24

• International Women's E-Commerce Days - September 22-29, 2026 (2025 TBD)

• International Women's Friendship Month - September

• International Women's Week - March 7-10, 2026

• International Workers Day - May 1

• International Working Women's Day - March 8

• International Year of Artisanal Fisheries and Aquaculture - Annual United Nations Observance Year 2022 (A/Res/72/72)
  

• International Year of Camelids - Annual United Nations Observance Year 2024 (A/Res/72/210)

• International Year of Cooperatives - Annual United Nations Observance Year 2012

• International Year of Creative Economy for Sustainable Development - Annual United Nations Observance Year 2021

• International Year of Crystallography - Annual United Nations Observance Year 2014

• International Year of Family Farming - Annual United Nations Observance Year 2014
  

• International Year of Fruits and Vegetables - Annual United Nations Observance Year 2021

• International Year of Indigenous Languages - Annual United Nations Observance Year 2019

• International Year of Light and Light-based Technologies - Annual United Nations Observance Year 2015

• International Year of Moderation - Annual United Nations Observance Year 2019 (A/Res/72/129)

• International Year of Peace and Trust - Annual United Nations Observance Year 2021

• International Year of Plant Health - Annual United Nations Observance Year 2020

• International Year of Pulses - Annual United Nations Observance Year 2016

• International Year of Quinoa - Annual United Nations Observance Year 2013

• International Year of Small Island Developing States - Annual United Nations Observance Year 2014
  

• International Year of Soils - Annual United Nations Observance Year 2015

• International Year of Solidarity with the Palestinian People - Annual United Nations Observance Year 2014

• International Year of Sustainable Energy for All - Annual United Nations Observance Year 2012

• International Year of Sustainable Tourism for Development - Annual United Nations Observance Year 2017

• International Year of the Nurse and the Midwife - Annual United Nations Observance Year 2020

• International Year of the Periodic Table of Chemical Elements - Annual United Nations Observance Year 2019 (A/Res/72/228)

• International Year of Water Cooperation - Annual United Nations Observance Year 2013

• International Yoga Day - June 21

• International Youth Day - August 12

• International Young Eagles Day - June 13, 2026 (Second Saturday of June)

• International Zine Month - July

• Internaut Day - August 23

• Internet and E-Commerce Services Month - May

• Internet Self-Care Day - August 21

• Intersex Awareness Day - October 26

• Intersex Day of Remembrance - November 8

• Interstate Mullet Toss - April 24-26, 2026 (Last Full Weekend in April)
• Intimate Apparel Market Week - February 1-7, 2026 (First Week of February, May, August and November)

• Introduce a Girl to Engineering Day - February 26, 2026 (Thursday of National Engineers Week)
  

• Inventors Day - September 29

• Invictus Games - Next Games are July 10-17, 2027

• Invisible Day - July 4

• Invite an Alien to Live with You Day - July 21

• Iowa State Holidays

• IPod Day - October 23

• Iris Day - May 8

• Irish-American Heritage Month - March

• Irritable Bowel Syndrome (IBS) Awareness Month - April

• Islamic New Year - Evening of June 16, 2026 to Evening of June 17, 2026

• Islander Day (Canada) - February 16, 2026

• Isra and Mi'raj - Evening of January 15, 2026 to Evening of January 16, 2026 (Muslim Holiday)

• IT Professionals Day - September 15, 2026 (Third Tuesday in September)

• Italian-American Heritage Month - October

• It's About Time Week - December 25-31

• It's Letter Writing Day - November 28

• IUGR Awareness Day - March 13 (IUGR = Intrauterine Growth Restriction)

• Iwo Jima Day (Landing) - February 19
  

• Iwo Jima Day (Flag Raised) - February 23

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