Events that occurred on 16 December.
 On Earth
- 1913 – In an annual Christmas rugby match at King Edward's School, alumni at Oxford and Cambridge play against the School's First XV. This year, the alumni J.R.R. Tolkien, Christopher Wiseman, T.K. Barnsley, Robert Gilson, G.B. Smith and Sidney Barrowclough lose 14-10.
- 1937 - J.R.R. Tolkien writes Letter 19.
- 1938 - Actor Wi Kuki Kaa is born.
- 1956 - The fifth episode of 1956 radio series of The Lord of the Rings airs on the BBC Third Programme.
- 1963 - J.R.R. Tolkien writes a letter to Baronne A. Baeyens.
- 1967 - Actress Miranda Otto is born.
- 1980 - The BBC Radio parody series Hordes of the Things finishes airing.
- 1989 - Actress Marjorie Westbury dies.