Events that occurred on 3 September.
 On Earth
- 1944 - J.R.R. Tolkien writes Letter 80.
- 1971 - Mythcon 2 in Santa Barbara, California.
- 2004 - The Evening Chronicle publishes an excerpt of a letter from Tolkien to an unknown fan.
- 2006 - The Lord of the Rings Musical closes at a loss in Toronto.