Wikipedia:Selected anniversaries/November 21
- 1272 - Edward I became King of England, succeeding his father Henry III who died five days earlier.
- 1783 - The first successful untethered flight by humans was made in a hot air balloon constructed by the Montgolfier brothers (pictured).
- 1920 - Anglo-Irish War: The Irish Republican Army killed more than a dozen British intelligence officers known as the Cairo Gang.
- 1920 - Anglo-Irish War: Paramilitary forces of the Royal Irish Constabulary opened fire on players and spectators at a Gaelic football match in Dublin on Bloody Sunday.
- 1977 - God Defend New Zealand became one of the national anthems of New Zealand.
Recent days: November 20 – November 19 – November 18
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