Events that occurred on 26 June.
 On Earth
- 1957 - J.R.R. Tolkien writes a letter to Deirdre Levinson.
- 1968 - J.R.R. Tolkien writes Letter 305.
- 2007 - Tree of Tales is published.
- 2010 - The Tolkien Society's Northern Hemisphere seminar: "Tolkien & Birmingham".
- 2012 - Tolkien and Welsh by Mark T. Hooker is published.
- 2016 - Scholar John Ellison dies.
 In Arda
- There are no known events for this day.