Events that occurred on 23 April.
 On Earth
- 1907 - Author Paul H. Kocher is born.
- 1925 - Sir Gawain and the Green Knight is first published.
- 1944 - J.R.R. Tolkien writes Letter 62.
- 1957 - Poet Roy Campbell dies.
- 1986 - Voice actor Otto Preminger dies.
- 1987 - Pictures under Discussion is published.
- 2010 - Musician and composer Bo Hansson dies.
- 2020 - Actor Bruce Allpress dies.
 In Arda
- There are no known events for this day.