|Holiday name||Holiday location||Holiday type|
|World Telecommunication and Information Society Day||-||International (Awareness & Cause, Products & Technology , United Nations)|
|Constitution Day||Nauru||Public Holiday|
|17 May Constitution Day (1814)||Norway||National Holiday, Flag Day|
|Galicia Literature Day||Spain (Galicia)||Local Holiday|
|Liberation Day||Congo Democratic Republic||Public Holiday|
|National Pack Rat Day||-||Unofficial (Lifestyle)|
|National Cherry Cobbler Day||-||Unofficial (Food & Drinks)|
|National Graduation Tassel Day||-||Unofficial (Education & Reading)|
|National Walnut Day||-||Unofficial (Food & Drinks)|
|Take Your Parents To The Playground Day||-||Unofficial (Fun & Joy, Relationships & Family)|
Historical Events on May 17
- 1875: The first Kentucky Derby is won by Aristides – an American thoroughbred that was trained by Ansel Williamson.
- 1900: The city of Mafeking, South Africa is relieved by British troops after a 217-day siege during the Second Boer War.
- 1902: The Antikythera mechanism – an ancient Greek analog computer – is discovered by archaeologist Valerios Stais.
- 1940: The city of Brussels in Belgium is occupied by German forces during World War 2.
- 1943: The attack on German dams known as the Dambuster Raids continues during World War II.
- 1954: In the case of Brown v. Board of Education of Topeka, Kansas, the U.S Supreme Court hands down a unanimous decision.
- 1973: During the Watergate Scandal, televised hearings start in the U.S Senate.
- 1974: 6 people are killed when L.A police officers raid the Symbionese Liberation Army’s HQ; Among those dead was Camilla Hall.
- 1977: The first Chuck E. Cheese restaurant is opened by Nolan Bushnell in San Jose, California.
- 1990: Homosexuality is removed from the list of psychiatric diseases by the General Assembly of the World Health Organization (WHO).
- 1995: An M60 tank is stolen from the California Army National Guard Armory is San Diego, California by Shawn Nelson. He would take the tank on a 23-minute rampage as police chased him. He was eventually shot and killed by officers after the tank became stuck on a median.
- 2004: In the state of Massachusetts in the United States, the first U.S same-sex marriages are performed.
- 2014: 17 people are killed during a plane crash in Laos.
Famous Birthdays on May 17
- Norwegian chemist and Nobel Prize laureate, Odd Hassel is born in 1897.
- French author Marie-Anne Desmarest is born in 1904.
- American boxer Sugar Ray Leonard is born in 1956.
- American comedian and actor, Bob Saget is born in 1956.
- Scottish-American comedian, actor and talk show host, Craig Ferguson is born in 1962.
- American singer-songwriter Trent Reznor is born in 1965.