Events that occurred on 30 June.
 On Earth
- 1955 - J.R.R. Tolkien writes Letter 165.
- 1966 - Actor Marton Csokas is born.
- 1969 - J.R.R. Tolkien writes a letter to Paul Bibire
- 1972 - J.R.R. Tolkien writes Letter 339, published in The Daily Telegraph as "Beautiful Place because Trees are Loved".
- 1972 - Mythcon III begins in Long Beach, California.
- 2003 - The Lord of the Rings Strategy Battle Game: Shadow and Flame is published.
- 2004 - War and the Works of J.R.R. Tolkien is published.
- 2009 - Languages, Myths and History is published.