Events that occurred on 10 December.
 On Earth
- 1824 - Author George MacDonald is born.
- 1941 - Baillie Tolkien is born.
- 1947 - Author and satirist Douglas C. Kenney is born.
- 1960 - J.R.R. Tolkien writes Letter 225.
- 1962 - J.R.R. Tolkien is interviewed by John Bowen.
 In Arda
- T.A. 3018: