Holidays and Observances
Alphabetical Listing of I Holidays

Below, you can find a Holidays and Observances Alphabetical Listing of US Holidays and World Holidays and Observances that start with I.  We are still adding names to the list, so more information will be coming. 

After we complete the summary pages on the site, we will start working on a detailed page(s) for each Holidays and Observance. Once a page is completed for each Holiday or Observance, it will be linked up below, as well as it's related Daily Holidays page. (that should keep us busy for the next 20 years or so!!)

Search for Holidays Alphabetically:

A, B, C, D, E, F, G, H, I, J, K, L, M, N, N-Pg2 O, P, Q, R, S, T, U, V, W, X-Y-Z

I

• I Am a Mentor Day - January 9

• 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 11, 2025 (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 1, 2025 (First Saturday in February)

• Idaho Human Rights Day - January 20, 2025 (State Holiday in Idaho on the Third Monday in January)

• Ides of March - March 15
  

• Idiopathic Intracranial Hypertension Awareness Month - September

• Iditarod Race - March 1-16, 2025 (Starts First Saturday in March)

• IEEE Global Engineering the Future Day - May 13

• If Pets had Thumbs Day - March 3
  

• 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 8, 2025 (Second Monday in September)

• Imbolic - February 2 (Pagan)

• Impersonate Authority Day - June 3

• Impossible Astronaut Day - April 23

• Improve Your Home Office Week - October 12-18, 2025 (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)

• Income Tax Pay Day - April 15, 2025

• Inconvenience Yourself Day - February 26, 2025 (Fourth Wednesday in February)

• Incredible Kid Day - March 20, 2025 (Third Thursday in March)
  

• Independence Day (Fourth of July) - July 4

• Independence Day Observed - July 4, 2025

• Independence From Meat Day - July 4

• Independent Bookstore Day - April 26, 2025 (Last Saturday in April)

• Independent Retailer Month - July

• India Pale Ale Beer Day - August 7, 2025 (First Thursday in August)

• Indiana Flower and Patio Show - March 15-23, 2025

• Indianapolis 500 - May 25, 2025 (Sunday of Memorial Day Weekend)

• Indigenous People's Day - October 13, 2025 (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

• Infants Immunization Week - April 20-26, 2025 (Fourth Week of April)

• Infection Control Week - October 12-18, 2025 (Third Week of October)

• Information Overload Day - October 21, 2025 (Third Wednesday in October)

• Informed Woman Month - April
  

• Ingersoll Day - August 11

• Innergize Day - September 23, 2025 (Day after the Autumn Equinox which falls on September 22, 2025)

• 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 4, 2025 (First Saturday in October)

• Intergalactic Star Wars Day - May 4

• Intergeneration Day - October 5, 2025 (First Sunday in October)

• Intergeneration Month - September

• International Accounting Day - November 10

• International Adjust Your Chair Day - October 20, 2025 (Third Monday in October)

• International African Diaspora Day - October 5, 2025 (First Sunday in October)

• International African Penguin Awareness Day - October 11, 2025 (Second Saturday in October)

• International AIDS Awareness Month - December

• International Air Ambulance Week - September 8-14, 2025

• International Albarino Days - TBD

• 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 3-9, 2025 (Starts on First Sunday in August)

• International Asteroid Day - June 20

• International Astrology Day - March 20, 2025 (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 22, 2025 (Fourth Saturday in November)

• International Awareness Day - May 12

• International Baby Lost Mother's Day - May 4, 2025 (First Sunday in May)

• International Bacon Day - August 30, 2025 (Saturday before Labor Day which falls on September 2, 2024)

• International Bagpipe Day - March 10

• International Banana Festival - September 21
  

• International Bandanna Day - October 31, 2025 (Last Friday in October)

• International Bat Appreciation Day - April 17

• International Bat Night(s) - August 30-31, 2025 (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 1, 2025 (First Friday in August)

• International Bereaved Mothers Day - May 4, 2025 (First Sunday in May)

• International Biodiesel Day - August 10

• International Blessings of the Fishing Fleet Day - October 5, 2025 (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 10-16, 2025

• International Brain Teaser Month - January
  

• International Building Safety Week - May 4-10, 2025 (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 5, 2025 (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 17-26, 2025 (Monaco)

• International Civil Aviation Day - December 7

• International Civility Awareness Month - May

• International Clash Day - February 7

• International Clean Hands Week - September 21-27, 2025 (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 4-10, 2025 (First Full Week in May)

• International Clothesline Week - June 7-13, 2025 (starts on the first Saturday in June

• International Clown Week - August 1-7

• International Coaching Week - May 12-18, 2025

• International Coastal Cleanup Day - September 20, 2025 (Third Saturday)
  

• International Coelenterate Biology Week - (2025 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 16, 2025 (Third Thursday in October)

• International Credit Union Week - October 12-18, 2025 (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 21-28, 2025

• International Day against DRM (Digital Rights Management) - 2025 TBA

• 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 8, 2025 (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 5, 2025 (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 Space flight - April 12

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

• International Day of Listening - September 18, 2025

• 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 9, 2025 (Second Wednesday in April)

• International Day of Prayer for the Persecuted Church - November 2, 2025 (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 28, 2025 (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 21-27, 2025 (Last Whole Week in September from Sunday - Saturday)

• International Defense Transportation Day - May 16, 2025 (Third Friday in May)

• International DIS Awareness Month - December

• International Dog Biscuit Appreciation Day - February 23

• International Doodle Dog Day - May 3, 2025 (First Saturday in May)

• International Dot Day - September 15

• International Drive Your Studebaker Day - September 13, 2025 (Second Saturday in September)

• International Drone Day - May 3, 2025 (First Saturday in May)

• International Drum Month - May

• International Drum (Percussion) Month - November

• International Dylan Thomas Day - May 14

• International Dyslexia Association Reading Week - October 23-25, 2025

• International Ear Care Day - March 3

• International Earth Day - March 20, 2025 (Same Day as Spring Equinox)
  

• International Eat an Animal for PETA Day - March 15

• International Eat an Apple Day - September 20, 2025 (Third Saturday in September)

• International Energy Week - February 25-27, 2025

• International Enthusiasm Week - September 1-7

• International Epilepsy Day - February 10, 2025 (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, 2025

• International Fanny Pack Day - March 8, 2025 (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 7-9, 2025 (First Full Weekend in March)

• International Fetish Day - January 17, 2025 (Third Friday in January)

• International Financial Independence Awareness Day - April 25

• International Firefighter's Day - May 4

• International Firewalk Day - April 5, 2025 (First Saturday in April)

• International Firgun Day - July 17

• International Flirting Week - February 9-15, 2025 (Week of Valentines Day)

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

• International Folding Laundry Day - March 30

• International Forgiveness Day - August 3, 2025 (First Sunday in August)

• International Francophonie Day - March 20

• International Fraud Awareness Week - November 16-22, 2025 (Third Week in November)

• International Friendship Day - July 30

• International Friendship Month - February

• International Friendship Week - (2025 TBD)

• International Frozen Yogurt Day - February 6

• International Fun at Work Day - April 1, 2025 (April 1st, unless it falls on weekend, then the first Thursday in April)

• International Games Day - November 15, 2025 (Third Saturday in November)

• International Games Month - November

• International Geocaching Day - August 16, 2025 (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 24, 2025 (Fourth Thursday in April)

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

• International Golden Retriever Day - February 3

• International Goof Off Week - March 16-22, 2025 (Third Full Week of March)

• International Grenache Day - September 19, 2025 (Third Friday in September)

• International Group B Strep Awareness Month - July

• International Guide Dog Day - April 30, 2025 (Last Wednesday in April)

• International Guinness World Records Day - November 13, 2025 (Thursday of Second Full Week in November)

• International Guitar Month - April

• International Hamburger Day - May 28

• International Hangover Day - August 2, 2025 (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 24, 2025 (Saturday of Third Full Week)

• International Heritage Breeds Week - May 18-24, 2025 (Third Week of May)

• International Homeless Animals Day -  August 16, 2025 (Third Saturday of August)

• International Hoof Care Month - February

• International Hoof Care Week - January 21-24, 2025

• International Hot Air Balloon Week - January 26 - February 1, 2025 (Fourth Full Week of January)
  

• International Hot & Spicy Food Day - January 16

• International Housekeepers Week - September 14-20, 2025 (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 Ideas Month - March

• International Image Consultant Day - November 23

• International Independent Video Store Day - October 18,  2025 (Third Saturday in October)

• International Infection Prevention Week - October 19-25, 2025

• International Internal Audit Awareness Month - May
  

• International Internet Day - October 29

• International Interpreters and Translators Week - September 21-27, 2025 (Last Full Week in September

• International Inuit Day - November 7

• International Jazz Day - April 30 as well as May 24, 2025 (Saturday of Memorial Day Weekend)

• International Jewish Book Day - (2025 TBD) (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 4, 2025 (First Friday in April)

• International Kissing Day or World Kiss Day - July 6

• International Kite Day - January 14

• International Lace Day - September 27, 2025 (Last Saturday in September)

• International Lace Week - August 3-8, 2025

• International Language Week - Third Week of December
  

• International Lefthander's Day - August 13

• International Lego Day - January 28

• International Lesbian Day - October 8

• International Lightning Safety Day - June 28, 2025

• International Listening Association Week - June 30 - August 2, 2025

• 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 26, 2025 (Closest Saturday to April 25th)

• International Mariachi Week - April 23-27, 2025

• International Mathematicians Week - August 1-9

• 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 10, 2025 (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 2-8, 2025 (Monday - Friday of First Full Week in February)

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

• International Newspaper Carrier Day - October 11, 2025 (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 1, 2025 (First Saturday in March)

• International Orangutan Day - August 19

• International Overdose Awareness Day - August 31

• International Pancake Day - February 28, 2025 (47 Days Before Easter)

• International Panic Day - June 18

• International Pathology Day - November 12, 2025 (Second Wednesday in November)

• International People Skills Month - September
  

• International Permaculture Day - May 4, 2025 (First Sunday in May)

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

• International Phace Syndrome Awareness Week - March 23-29, 2025 (Last Week of March)

• International Pickle Day- May 16

• International Pickles Week - Third Week in May

• International Picnic Day - June 18

• International Pillow Fight Day - April 5, 2025 (First Saturday in April)
  

• International Pisco Sour Day - February 1, 2025 (First Saturday in February)

• International Pixel-Stained Technopeasant Day - April 23

• International Pizza Cake Day - April 17, 2025 (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 5-11, 2025 (First Full Week of October)

• International Prenatal Infection Prevention Month - February
  

• International Print Day - October 22, 2025 (Fourth Wednesday in October)

• International Printing Week - Third Week of January

• International Programmer's Day - January 7 and also on September 13, 2025 (September 13 or on September 12 in Leap Years)
  

• International Project Management Day - November 6, 2025 (First Thursday in November)

• International Quality of Life Month - January
  

• International Rabbit Day - September 27, 2025 (Fourth Saturday or Sunday in September)

• International Raccoon Appreciation Day - October 1

• International Ragweed Day - June 28, 2025 (Fourth Saturday in June)

• International Raw Milk Cheese Appreciation Day - April 19, 2025 (Third Saturday in April)

• International Read an eBook Day - September 18

• International Read Comics in Public Day -  August 28

• International Red Panda Day - September 20, 2025 (Third Saturday in September)

• International Reggae Day - July 1

• International Repair Day - October 18, 2025 (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 16-22, 2025 (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 27, 2025 (Wine!!) (Fourth Friday in June)

• International Safety Pin Day - April 10

• International Sandsculpting Championship - September 26 - October 5, 2025 (Virginia Beach)

• International Scented Candle - November 1

• International Scrapbooking Industry Day - March 4

• International Sculpture Day - April 26, 2025 (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 16, 2025 (Third Thursday in October)

• International Shareware Day - December 13, 2025 (Second Saturday in December)

• International Ship in a Bottle Day - October 4

• International Sister Cities Day - November 1, 2025 (First Saturday in November)

• International Sloth Day - October 20

• International Snailpapers Day - April 7

• International Snow Sculpture Championships - January 20-29, 2025

• International Snowmobile Safety and Awareness Week - January 11-19, 2025

• International Space Day - May 2, 2025 (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 15, 2025 (Third Saturday in March)

• International Square Dancing Month - September

• International Stage Management Day - October 10

• International Stand Up to Bullying Day - February 28, 2025 and November 21, 2025 (Last Friday in February and Third Friday in November)

• International Starman Month - October
  

• International Stout Day - November 6, 2025 (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 5, 2025 (First Wednesday in 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 21, 2025 (First Day in Summer)

• International Survivors of Suicide Day - November 22, 2025 (Saturday Before Thanksgiving)
  

• International Sushi Day - June 18

• International Sweater Vestival - December 5, 2025 (Second Friday after Thanksgiving)

• International Sweatpants Day - January 21

• International Sword Swallowers Day - February 22, 2025 (Last Saturday in February)

• International Systems Engineer Day - November 28, 2025 (Last Friday in November)

• International T-Shirt Day - June 21

• International Table Top Day - April 26, 2025 (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 17-23, 2025 (Seven Days Starting on the Third Monday in March)

• International Tempranillo Day - November 13, 2025 (Second Thursday in November)

• International Thank-You Day - January 11

• International Tiara Day - May 24

• International Tiger Day - July 29

• International Tongue Twister Day - February 26, 2025 (Last Saturday in February)
  

• International Toot Your Flute Day - October 4

• International Top Spinning Day - October 8, 2025 (Second Wednesday in October)

• International Town Criers Day - July 14, 2025 (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 17-19, 2025

• International Tripawd Awareness Day - March 3

• International Trombone Week - April 6-13, 2025

• 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 16, 2025 (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 6, 2025 (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 9-15, 2025 (The Week in Which November 11 Falls)

• International Week of the Deaf - September 21-27, 2025 (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 19-24, 2025 Virtual Event May 1-7, 2022

• International Winter Bike to Work Day - February 14, 2025 (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 15-21, 2024 (2025 TBD)

• International Women's Friendship Month - September

• 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 14, 2025 (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 25-27, 2025 (Last Full Weekend in April)

• Introduce a Girl to Engineering Day - February 20, 2025 (Thursday of National Engineers Week)
  

• Inventors Day - September 29

• Invictus Games - February 8-16, 2025

• Invisible Day - July 4

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

• 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 26, 2025 to Evening of June 27, 2025

• Isra and Mi'raj - Evening of January 26, 2025 to Evening of January 27, 2025 (Muslim Holiday)

• IT Professionals Day - September 16, 2025 (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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