Events that occurred on 5 August.
 On Earth
- 1906 - Actor John Huston is born.
- 1937 - Actor Alan Howard is born.
- 1948 - J.R.R. Tolkien writes Letter 116.
- 1957 - J.R.R. Tolkien writes two letters to Jerome W. Archer, Director of Libraries at Marquette University.
- 1969 - Actress Kim Mai Guest is born.
- 1975 - Editor Jabez Olssen is born.
- 1990 - Mythcon 21 at California State University in Long Beach.
- 1994 - Mythcon 25 at American University, Washington, D.C.
- 1995 - Mythcon 26 in Berkeley, California.
- 2001 - Mythcon 32 in Berkeley, California.
- 2002 - The History of Middle-earth Index is published.
- 2005 - Omentielva Minya - 1st International Conference on Tolkien's Invented Languages in Stockholm, Sweden.
- 2006 - Mythcon 37 at University of Oklahoma, Norman.
- 2007 - Mythcon 38 in Berkeley, California.
- 2012 - Mythcon 43 at University of California, Berkeley.