Events that occurred on 25 June.
 On Earth
- 1937 - Author Timothy J. Wheeler is born.
- 1957 - J.R.R. Tolkien writes Letter 200.
- 1963 - J.R.R. Tolkien writes Letter 245.
- 1989 – The first meeting of members of the Elvish Linguistic Fellowship takes place at the residence of Bill Welden.
- 2001 - Actress Pauline Letts dies.