- 1820 23 Feb Police arrest the plotters of the 'Cato Street Conspiracy', who planned to blow up the British cabinet.
- 1903 23 Feb The United States receives a 'perpetual lease' on Guantanamo Bay in Cuba, now home to Camp X-Ray prison.
- 1945 23 Feb Marines raise the US flag on Iwo Jima in the Pacific, in one of the great iconic images of World War Two.

