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Events that occurred on 1 June.
 On Earth
- 1840 - George William Tolkien dies.
- 1914 - George Sayer, friend of J.R.R. Tolkien, is born.
- 1917 - J.R.R. Tolkien is considered fit for general service again.
- 1917 - Edith Tolkien writes her final letter to her husband at Thirtle Bridge army camp, near Withernsea from her lodgings in Hornsea.
- 1961 - J.R.R. Tolkien writes a letter to Jan Broberg.
- 1966 - J.R.R. Tolkien writes a letter to Royston F. Porthouse.
- 1984 - Moria: The Dwarven City is published.
- 2005 - Tolkien and the Great War is released in paperback in the US.
- 2006 - Tolkien Studies: Volume 3 is published.
- 2017 - Beren and Lúthien is published.
- 2018 - Bodleian Library's exhibition "Tolkien: Maker of Middle-earth" begins. The companion books Tolkien: Maker of Middle-earth and Tolkien: Treasures will also be published.
 In Arda
- There are no known events on this day.