Browse all researched observances

World Flour Day

20 March · International flour/milling appreciation and charitable-action campaign; food/allergen boundaries apply

The current official World Flour Day site verifies March 20, present FlourWorld Museum/Mühlenchemie stewardship and the seasonal date rationale; contemporaneous 2019 industry material ident…

World Food Day

16 October · Food and Agriculture Organization of the United Nations observance

A/RES/35/70

World Food Safety Day

7 June · FAO / WHO / United Nations / international observance

A/RES/73/250

World Football Day

25 May · United Nations / international observance

A/RES/78/281

World Frog Day

20 March annually · International / amphibian conservation awareness

The current World Frog Day platform says the observance is held every year on 20 March and is organized by SAVE THE FROGS!; its own history notes earlier informal use of the date.

World Futures Day

2 December · UNESCO international day

Proclaimed by UNESCO General Conference in 2021

World Gin Day

Second Saturday in June annually · Global / World Gin Day organizer campaign

The official World Gin Day site states that the observance always falls on the second Saturday in June.

World Giraffe Day

21 June annually · International / Giraffe Conservation Foundation conservation campaign

The Giraffe Conservation Foundation states that it initiated World Giraffe Day, holds it annually on 21 June, and chose the solstice date to pair the tallest animal with the longest day or…

World Goth Day

22 May · International goth-subculture community celebration

World Goth Day official material verifies May 22, a 2009 UK Goth Day precursor, 2010 global expansion, co-founders BatBoy Slim and Martin Oldgoth, and current community stewardship.

World Green Roof Day

6 June · international green-roof design and urban-greening observance

The official World Green Roof Day site says Dusty Gedge and Chris Bridgman started the June 6 observance in 2020; Green Roof Organisation independently promotes the current event.

World Habitat Day

First Monday of October · United Nations international observance

A/RES/40/202 A

World Hamster Day

12 April · Informal animal-awareness calendar usage; canonical source wording is “World Hamster Day”

The Animal Medical Center repeatedly lists World Hamster Day on April 12 in annual pet-awareness calendars.

World Health Day

7 April · World Health Organization global health observance

WHA/A.2/Res.35

World Hearing Day

3 March · World Health Organization global health observance

World Hepatitis Day

28 July · World Health Organization global health observance

WHO observance

World Hippo Day

15 February annually in cited zoo practice · Hippopotamus awareness and conservation observance

Multiple established zoological institutions independently use February 15 for World Hippo Day, including current and multi-year observance by Zoos SA and Cincinnati Zoo; the original creat…

World Homeless Day

10 October annually · Global / World Homeless Day campaign

The official World Homeless Day site identifies October 10 as the annual date, October 10, 2010 as the inaugural observance and a collaborative online-discussion origin.

World Horse Day

11 July · United Nations / international observance

A/RES/79/291

World Hospice and Palliative Care Day

Second Saturday in October; 10 October 2026 verified · International / Worldwide Hospice Palliative Care Alliance-coordinated palliative-care observance

Current professional palliative-care material verifies the WHPCA-coordinated second-Saturday-in-October observance and 10 October 2026 date; published palliative-care history identifies the…

World Humanist Day

21 June annually · Humanists International / global humanist observance

Humanists International states that World Humanist Day is celebrated every year on 21 June and traces its organized observance to the 1980s.

World Humanitarian Day

19 August · United Nations / international observance

A/RES/63/139

World Hunger Day

28 May · Global hunger-awareness and community-action campaign; humanitarian/non-partisan scope

Current World Hunger Day first-party material verifies May 28, says The Hunger Project founded the observance in 2011, and identifies ongoing campaign leadership. Current statistics remain…

World Hydrography Day

21 June annually · International Hydrographic Organization / global observance

The International Hydrographic Organization states that World Hydrography Day is celebrated on 21 June; its 2026 page confirms 21 June 2026.

World Hypnotism Day

4 January annually · International organizer-led hypnosis/hypnotism awareness observance; non-coercive and non-clinical public scope

The official World Hypnotism Day site verifies January 4, maintains current event/participation resources and first-party archive material identifies Tom Nicoli as the originator. Exact fir…

World IBD Day

19 May · Organizer-backed international observance

The official World IBD Day campaign states that the observance was created in 2010 during Digestive Disease Week, takes place each May 19, and is coordinated by IFCCA with patient organizat…

World Immunization Week

24–30 April · World Health Organization global public-health campaign

WHO currently observes World Immunization Week on 24–30 April. The first global week was held across all six WHO regions in April 2012, followed by World Health Assembly resolution WHA65.18…

World Industrial Design Day

29 June · World Design Organization professional/public-engagement observance for industrial design

World Design Organization verifies annual June 29 observance and current stewardship. WDO first-party pages differ on a 2007 launch versus 2008 establishment, so the first-edition year rema…

World Intellectual Property Day

26 April · WIPO / United Nations / international observance

WIPO observance

World Interfaith Harmony Week

First week of February (1–7 February) · United Nations international week

A/RES/65/5

World Judo Day

28 October · International Judo Federation worldwide sport observance

International Judo Federation primary sources verify the first World Judo Day on 28 October 2011, annual IJF stewardship and the October 28 Jigoro Kano birthday rationale.

World Kidney Day

Second Thursday in March · International Society of Nephrology and International Federation of Kidney Foundations–World Kidney Alliance global awareness campaign

World Kidney Day states that the joint ISN and IFKF-WKA campaign started in 2006 and is celebrated every second Thursday in March; the 2026 campaign page identifies 12 March 2026.

World Kindness Day

13 November annually · World Kindness Movement / global organizer-led observance

The World Kindness Movement states that members plan World Kindness Day activities on 13 November each year; UNESCO MGIEP also describes the day as celebrated every 13 November.

World Kiswahili Language Day

7 July · United Nations / international observance

A/RES/78/312

World Lake Day

27 August · United Nations / international observance

A/RES/79/142

World Laughter Day

First Sunday of May · Laughter Yoga International-created global community observance

Laughter Yoga International states that Dr. Madan Kataria created World Laughter Day in 1998, with the first gathering in Mumbai; its current recurrence is the first Sunday of May.

World Lemur Day

Last Friday of October · Global lemur and Madagascar conservation observance coordinated by the Lemur Conservation Network with roots in Madagascar’s World Lemur Festival

Lemur Conservation Network verifies the last-Friday-in-October World Lemur Day rule and 30 October 2026. Its history traces the linked World Lemur Festival to a 2014 Antananarivo event orga…

World Letter Writing Day

1 September annually · Global / World Letter Writing Day founder-led initiative

World Letter Writing Day’s official site documents its launch on 1 September 2014 and continues to identify 1 September as the celebration date.

World Lion Day

10 August · international lion-awareness and conservation observance

Current conservation sources verify August 10 recurrence, while World Animal Protection and National Geographic attribute the 2013 founding to Dereck and Beverly Joubert.

World Listening Day

18 July annually · World Listening Project / global listening and acoustic-ecology campaign

The World Listening Project states that each year communities program World Listening Day activities on 18 July, the birthdate of R. Murray Schafer.

World Lizard Day

14 August annually in cited zoo practice · Lizard awareness and reptile-education observance

Akron Zoo states that World Lizard Day is celebrated each year on August 14, and Utah’s Hogle Zoo independently lists World Lizard Day on August 14 in its current animal-highlight calendar.…

World Logic Day

14 January · UNESCO international day

Proclaimed by UNESCO in 2019

World Malaria Day

25 April · World Health Organization global health observance

WHO observance

World Maritime Day

Last Thursday of September · United Nations / IMO international observance

IMO / UN observance

World Maths Day

25 March in the 2026 edition · 3P Learning / Mathletics global school mathematics event

3P Learning publishes World Maths Day as a global mathematics event and gives the date for the 2026 edition

World Meditation Day

21 December · United Nations / international observance

A/RES/79/137

World Meningitis Day

5 October · WHO-supported global health awareness observance

World Health Organization — Defeating Meningitis by 2030 framework and awareness platform

World Mental Health Day

10 October · Global mental-health observance

WHO observance

World Meteorological Day

23 March · WMO / United Nations / international observance

WMO/EC-XII/Res.6

World Metrology Day

20 May · UNESCO international day

UNESCO international day

World Migratory Bird Day

Second Saturday of May and second Saturday of October · UNEP-supported global conservation campaign

UNEP / CMS / AEWA partner campaign

World Milk Day

1 June · FAO-initiated global observance (not an official UN international day)

Food and Agriculture Organization of the United Nations (FAO)

World Motorcycle Day

21 June · International biking community / Association of Biking Community India event

The Association of Biking Community India states that its flagship World Motorcycle Day is celebrated every year on June 21.

World Mustang Day

17 April annually · Ford / Mustang heritage celebration

Ford first-party material identifies April 17 as World Mustang Day and ties the date to the Mustang’s public introduction on 17 April 1964; creator/first formal edition remain unresolved.

World Naked Gardening Day

First Saturday in May; 2 May in 2026 · International grassroots gardening/body-acceptance observance

The Naturist Education Foundation hosts current World Naked Gardening Day information, verifies the 10 September 2005 inaugural edition and historical date transitions, and states that the…

World Narcissistic Abuse Awareness Day

1 June annually · Global / WNAAD organizer-led awareness campaign

WNAAD first-party material identifies Bree Bonchay as founder, says the initiative was established in 2016 and confirms annual June 1 observance; independent APA and domestic-violence resou…

World Neglected Tropical Diseases Day

30 January · World Health Organization official global public-health day

World NF Awareness Day

17 May annually · Children’s Tumor Foundation / global NF awareness campaign

CTF verifies May 17 as World NF Awareness Day, distinguishes May 22 NF2-SWN awareness, and archives public use by 2013; the reviewed first-party sources do not establish a single founder or…

World NGO Day

27 February · international civil-society and NGO recognition observance

World NGO Day initiative; independently recognized in European External Action Service statements

World No Tobacco Day

31 May · WHO / international observance

WHA42.19

World Novel Week

Week of 13 October · UNESCO international week

Proclaimed at UNESCO’s 41st General Conference (2021)

World Numbat Day

First Saturday of November annually · Project Numbat / conservation awareness observance

Project Numbat’s archive identifies 7 November 2015 as the inaugural World Numbat Day and establishes the first Saturday of November recurrence; current Project Numbat material confirms ong…

World Nutella Day

5 February each year · Nutella / international brand community

Nutella/Ferrero first-party material identifies Sara Rosso as creator, February 5, 2007 as the launch and 2015 as the stewardship handoff to Ferrero.

World Occupational Therapy Day

27 October · World Federation of Occupational Therapists international professional observance

WFOT first-party material verifies annual October 27 observance, first launch on 27 October 2010 and continuing international professional stewardship.

World Oceans Day

8 June · United Nations international observance

A/RES/63/111

World Octopus Day

8 October annually in cited animal-welfare and aquarium sources · Octopus awareness, welfare and marine-life education observance

TONMO states that it initiated World Octopus Day; its preserved 2007 community thread documents the lineage that evolved into Cephalopod Awareness Days and October 8 World Octopus Day.

World Olive Tree Day

26 November · UNESCO international day

Proclaimed at UNESCO’s 40th General Conference (2019)

World Ovarian Cancer Day

8 May annually · International / World Ovarian Cancer Coalition annual awareness and mobilisation campaign

World Ovarian Cancer Coalition states that World Ovarian Cancer Day was established in 2013 by global ovarian-cancer advocacy leaders, is observed on May 8, and is currently coordinated thr…

World Pancreatic Cancer Day

Third Thursday of November · World Pancreatic Cancer Coalition global cancer-awareness campaign

The World Pancreatic Cancer Coalition verifies 19 November 2026 and records that international pancreatic-cancer organizations launched the inaugural World Pancreatic Cancer Day in 2014; co…

World Pangolin Day

Third Saturday of February · international pangolin conservation awareness observance

The IUCN SSC Pangolin Specialist Group says World Pangolin Day is celebrated on the third Saturday of February and was founded in 2012 by Rhishja Cota.

World Parkinson's Day

11 April · Organizer-backed international observance

Parkinson's Europe and the international Parkinson’s community

World Parrot Day

31 May · Global / World Parrot Trust conservation and welfare observance

World Parrot Trust states that World Parrot Day began in 2004, is observed each May 31, and continues as a WPT-led global conservation and welfare campaign.

World Passion Fruit Martini Day

28 May · International promotional/cocktail context / Funkin Cocktails-created observance

Current references place World Passion Fruit Martini Day on May 28 and attribute its establishment in 2021 to Funkin Cocktails.