Events that occurred on 25 October.
 On Earth
- 1893 - Robert Gilson, childhood friend of Tolkien, is born.
- 1924 - Actor Billy Barty is born.
- 1943 - J.R.R. Tolkien writes Letter 50.
- 1944 - J.R.R. Tolkien writes Letter 87.
- 1958 - J.R.R. Tolkien writes Letter 213.
- 1960 - J.R.R. Tolkien seeks to publish "The End of Bovadium".
- 2003 - RingCon III in Tacoma, Washington.
- 2005 - The Tolkien Ensemble publish their fourth album, Leaving Rivendell.
- 2007 - The Lord of the Rings Online: Shadows of Angmar, "Prisoner of the Free Peoples" is released in Europe.
- 2010 – German translator Walter Scherf dies.