Events that occurred on 1 April.
 On Earth
- 1977 - J.R.R. Tolkien's children found The Tolkien Trust charity.
- 1984 - The Monsters and the Critics is published in the US.
- 2003 - J.R.R. Tolkien: His Life and Works is published.
- 2006 - The Roots of Tolkien's Middle Earth is published.
- 2010 - The Legend of Sigurd and Gudrún is released in paperback.
- 2010 - West of the Mountains, East of the Sea is published.