| Holiday name | Holiday location | Holiday type |
|---|---|---|
| Aymara New Year Day | Bolivia | National Holiday |
| International Day of Yoga | - | International (Health & Body, United Nations) |
| National Day | Greenland | Public Holiday |
| Day of the Martyrs | Togo | Public Holiday |
| Music Festival | Congo Democratic Republic | Observance |
| National Selfie Day | - | Unofficial (Fun & Joy) |
| National Peaches ‘N’ Cream Day | - | Unofficial (Food & Drinks) |
| National Day of the Gong | - | Unofficial (Art & Entertainment, Hobby & Creativity) |
| Go Skateboarding Day | - | Unofficial (Activity & Action, Sports) |
| National Daylight Appreciation Day | - | Unofficial (Nature & Environment) |
| National Seashell Day | - | Unofficial (Hobby & Creativity) |
| June Solstice | Multiple [Show] | Season |
| National Indigenous Peoples Day | Canada (Northwest Territories, Yukon) | Local Holiday |
| Father's Day | Uganda | Observance |
Historical Events on June 21
- 1734: After being convicted of setting the city of Montreal in New France on Fire, Marie-Joseph Angélique is executed.
- 1749: In Nova Scotia, Halifax is officially established.
- 1788: New Hampshire ratifies the U.S Constitution and then becomes the 9thS State.
- 1791: King Louis XVI of France and his family attempt to escape France during the French Revolution.
- 1798: At the Battle of Vinegar Hill during the Irish Rebellion of 1798, Irish rebels are defeated by British forces.
- 1813: At the Battle of Vitoria, Joseph Bonaparte is defeated by Wellington.
- 1898: Guam is captured from Spain by the U.S.
- 1940: The first successful navigation of the Northwest Passage from the western portion to the eastern begins at the city of Vancouver in British Columbia.
- 1942: German and Italiam forces seize Tobruk during World War 2.
- 1942: Surfacing near the Columbia River in Oregon, an Imperial Japanese submarine fires seventeen shells at Fort Stevens.
- 1945: The Battle of Okinawa comes to a conclusion during World War II.
- 1973: The Miller Test for obscenity in United States’ law is established when the U.S. Supreme Court hands down the decision in Miller v. California 413 US 15.
- 1982: For the attempted assassination of United States’ President Ronald Reagan, John Hinckley is found not guilty because of insanity.
- 1989: In the case Texas v. Johnson, the United States Supreme Court rules that flag burning is a form of acceptable political protest that is protected by the 1st
- 2006: The newly discovered moons of Pluto are given names: Hydra and Nix.
Famous Birthdays on June 21
- French philosopher and author, Jean-Paul Sartre is born in 1905.
- American philosopher William Frankena is born in 1908.
- American novelist Mary McCarthy is born in 1912.
- English historian James Joll is born in 1918.
- American actress and singer, Judy Holliday is born in 1921.
- American actress and singer, Jane Russell is born in 1921.
- American actress Maureen Stapleton is born in 1925.
- Pakistani financier and 11th Prime Minister of Pakistan, Benazir Bhutto is born in 1953.
- American singer-songwriter Kip Winger is born in 1961.
- American actor Doug Savant is born in 1964.
- English actor David Morrissey is born in 1964.
