Events that occurred on 3 June.
 On Earth
- 1911 - Swedish translator Åke Ohlmarks is born.
- 1930 - Author Marion Zimmer Bradley is born.
- 1945 - J.R.R. Tolkien writes Letter 101.
- 1947 - Voice actor Matthew Locricchio is born.
- 2004 - The Lord of the Rings Symphony at Atlanta Symphony Hall, Georgia.
- 2005 - The Tolkien Gateway opens as wiki.
 In Arda
- There are no known events on this day.