Events that occurred on 6 January.
 On Earth
- 1914 - J.R.R. Tolkien begins working on The Book of Ishness.
- 1965 – J.R.R. Tolkien receives a fan letter from Iris Murdoch.
- 1965 - J.R.R. Tolkien writes a letter to his grandson Michael George, published as Letter 266.
- 1966 - A.R. Rahman, composer of The Lord of the Rings Musical, is born.
- 1992 - The Tolkien Family Album is published.
- 1992 - Sauron Defeated is published in the UK.
- 1997 - A new edition of The Monsters and the Critics is published.