Events that occurred on 23 June.
 On Earth
- 1929 - Barbara Remington, cover artist on some American editions, is born.
- 1945 - J.R.R. Tolkien is elected Merton Professor of English Language and Literature.
- 2009 - The Lord of the Rings Online: Mines of Moria, "Scourge of Khazad-dûm" is released.
 In Arda
- There are no known events for this day.