Events that occurred on 11 May
 On Earth
- 1922 - A Middle English Vocabulary, Tolkien's first book, is published.
- 1944 - J.R.R. Tolkien writes Letter 67.
- 1980 - The animated film The Return of the King is first aired in the US.
- 1997 - Final day of Bree Moot 3 in Minneapolis.
- 2001 - Kinder Surprise begins its Lord of the Rings promotion in Germany.
 In Arda
- There are no known events for this day.