Events that occurred on 9 August
 On Earth
- 1914 - Artist Tove Jansson is born.
- 1923 - Voice actor John Stephenson is born.
- 1932 - Voice actor Denys Hawthorne is born.
- 1945 – As the bombs are dropped on Hiroshima and Nagasaki, Tolkien denounces these tactics as "utter folly".
- 1973 - The last known photograph of J.R.R. Tolkien is taken, in front of his favourite tree, the Pinus Nigra (named Laocoon), at the Botanic Garden in Oxford.
- 1981 - The twenty-third episode of the 1981 radio series of The Lord of the Rings is aired on BBC Radio 4.
- 1981 - Mythcon 12 at Mills College in Oakland, California.
- 1986 - Mythcon 17 at California State University in Long Beach.
- 1997 - Mythcon 28 at Pepperdine University in Malibu, California.
- 2005 - The Lord of the Rings Symphony plays in Herodion, Greece.
- 2007 - Omentielva Tatya - 2nd International Conference on Tolkien's Invented Languages in Antwerp, Belgium.
- 2009 - Omentielva Nelya - 3rd International Conference on Tolkien's Invented Languages in Whitehaven, England.
- 2013 - Omentielva Lempea - 5th International Conference on Tolkien's Invented Languages in Helsinki, Finland.
- 2014 - Mythcon 45 in Wheaton College, Massachusetts.
- 2015 - Omentielva Enquea - Sixth International Conference on Tolkien's Invented Languages in Greisinger Museum, Switzerland.