Events that occurred on 23 August
 On Earth
- 1925 - The first recorded date in the writing of the Lay of Leithian, at Line 557.
- 1974 - Mythcon 5 at Scripps College in Claremont, California.
- 1981 - The twenty-fifth episode of the 1981 radio series of The Lord of the Rings is aired on BBC Radio 4.
- 1990 - The War of the Ring is published in the UK.
- 1992 - The second part of the 1992 radio series of Farmer Giles of Ham is aired on BBC Radio 5.
- 1992 - Tolkien Centenary Conference, a combination of Oxonmoot 1992 and Mythcon 23, at Keble College, Oxford.
- 2006 - The Oxford Tolkien Conference at Exeter College, Oxford.