Events that occurred on 18 June.
 On Earth
- 1905 - Actress Marjorie Westbury is born.
- 1914 - The Chequers Clubbe, founded by J.R.R. Tolkien, meet to have dinner.
- 1917 - Actor Richard Boone is born.
- 1929 - Priscilla Tolkien is born.
- 1956 - Actor Dominic Guard is born.
- 2002 - The Standard Deviants: Rings, Kings and Things is released.
 In Arda
- There are no known events for this day.