Events that occurred on 30 April.
 On Earth
- 1915 - J.R.R. Tolkien writes the poem Kôr.
- 1941 - Voice actor Sean Arnold is born.
- 1944 - J.R.R. Tolkien writes Letter 64.
- 1952 - Brazilian translator Ronald Kyrmse is born.
- 1954 - J.R.R. Tolkien writes a letter to Stanley Unwin.
- 1954 - Programmer Don Woods is born.
- 1995 - Voice actor Michael Graham Cox dies.
- 2003 - J.R.R. Tolkien: A Biography by Leslie Ellen Jones is published.
- 2004 - Tolkien Studies: Volume 1 is published.
- 2005 - The Forsaken Realm of Tolkien is published.
- 2005 - Interrupted Music: The Making of Tolkien's Mythology is published.
- 2007 - Roots and Branches is published.
- 2011 - Tolkien and Wales: Language, Literature and Identity by Carl Phelpstead was published.
- 2018 - Poetry and Song in the works of J.R.R. Tolkien is published.
- 2020 - The Deluxe edition of Sir Gawain and the Green Knight: with Pearl and Sir Orfeo is published.
 In Arda
- There are no known events for this day.