September 2: National Day in Vietnam (1945)
Great Fire of London
Impending collision of Princess Alice
Pedro II of Brazil and Teresa Cristina of the Two Sicilies
September 5: Labour Day in Canada and Labor Day in the United States (2022)
Battle of the Chesapeake
September 6: Defence Day in Pakistan (1965)
Parliament House, Singapore
September 8: Victory Day in Malta
Map of the transition from the Sui to the Tang Dynasty
Section of the Large Hadron Collider
September 11: National Day of Catalonia
Orchestra and choir assembled to perform Mahler's Symphony No. 8
Model of Luna 2
Nur Muhammad Taraki
- AD 81 – Domitian, the last Flavian emperor of Rome, was confirmed by the Senate to succeed his brother Titus.
- 1723 – António Manoel de Vilhena, Grand Master of the Knights Hospitaller, laid the first stone of Fort Manoel in Malta.
- 1960 – At a conference held in Baghdad, the governments of Iran, Iraq, Kuwait, Saudi Arabia, and Venezuela founded OPEC to help coordinate their petroleum policies and influence global oil prices.
- 1979 – Afghan president Nur Muhammad Taraki (pictured) was overthrown and later killed on the orders of Hafizullah Amin, who succeeded him.
- 1992 – The Constitutional Court of Bosnia and Herzegovina declared the breakaway Croatian Republic of Herzeg-Bosnia to be unconstitutional.
September 15: Battle of Britain Day in the United Kingdom (1940)
September 16: Arba'een / Arba'een Pilgrimage (Shia Islam, 2022)
Battle of Harlem Heights
September 17: Constitution Day in the United States (1787)
Smoke rising above Amman during Black September
September 18: Banned Books Week begins (2022); Battle of Britain Day in Canada (2022)
Flag of Scotland
September 19: International Talk Like a Pirate Day
Edward the Black Prince
L. Ron Hubbard
September 21: International Day of Peace
The Great Fire of New York
- 1170 – Norman invasion of Ireland: English and Irish forces conquered Dublin, forcing Ascall mac Ragnaill, the last Norse–Gaelic king of Dublin, into exile.
- 1776 – American Revolutionary War: The Great Fire of New York (depicted) broke out during the British occupation of New York City, destroying up to 1,000 buildings.
- 1934 – The Muroto typhoon, the strongest in Japanese history at the time, made landfall on the mainland, killing more than 3,000 and leaving around 200,000 homeless.
- 1937 – J. R. R. Tolkien's fantasy children's novel The Hobbit, which later served as a prelude to The Lord of the Rings, was first published.
- 1968 – The Soviet Union's Zond 5 landed in the Indian Ocean, becoming the first spacecraft to safely return to Earth after travelling around the Moon.
September 23: Celebrate Bisexuality Day
Richard Nixon delivering the Checkers speech
September 24: Heritage Day in South Africa
Sir James Brooke
Peking opera performer
September 26: First day of Rosh Hashanah (Judaism, 2022, AM 5783)
September 27: Meskel (Orthodox Tewahedo)
Aung San Suu Kyi
William the Conqueror
September 29: Michaelmas (Western Christianity)
September 30: Orange Shirt Day in Canada