Events that occurred on 21 November.
 On Earth
- 1915 - G.B. Smith is shipped to France.
- 1924 - Christopher Tolkien is born.
- 1964 - The seventh episode of the Princess-serialization of The Hobbit is published.
- 1972 - J.R.R. Tolkien writes Letter 343.
- 2006 - The RiffTrax commentary of The Lord of the Rings: The Fellowship of the Ring is released online.