Events that occurred on 25 July
 On Earth
- 1938 - J.R.R. Tolkien writes Letter 29.
- 1938 - J.R.R. Tolkien sends an angry letter to a German publisher, after being asked whether he was Aryan or not.
- 1980 - Mythcon XI at University of Nevada, Reno.
- 1987 - Mythcon XVIII at Marquette University, Milwaukee.
- 1991 - Voice actor Brian Haines dies.
- 2002 - The Uncharted Realms of Tolkien is published.
- 2003 - Mythcon XXXIV in Nashville, Tennessee.
- 2005 - Tolkien's Mighty Pen is published.
- 2009 - Tolkien Thing 2009 in Rieneck, Germany.