Events that occurred on 6 December.
 On Earth
- 1961 - J.R.R. Tolkien writes Letter 235.
- 1965 - J.R.R. Tolkien writes a letter to G.S. Rigby Jr..
- 1994 - The War of the Jewels is published in the US.
- 1996 - The Peoples of Middle-earth is published in the US.
- 2002 - The Lord of the Rings: The Two Towers Photo Guide is published.
- 2002 - The Fellowship of the Ring is released in the EU for PlayStation 2.
- 2016 - Actor Peter Vaughan dies.