Events that occurred on 16 March
 On Earth
- 1837 - Mary Wall dies.
- 1916 - J.R.R. Tolkien receives his degree from the University of Oxford.
- 1921 - J.R.R. Tolkien is appointed to membership of the Faculty of Arts and the Board of the Faculty Arts at the University of Leeds.
- 1931 - Philosopher Anthony Kenny is born.
- 1933 - Tolkien writes a letter to Kenneth Sisam.
- 1949 - J.R.R. Tolkien writes Letter 120.
- 1964 - Artist Quinton Hoover is born.
- 1967 - J.R.R. Tolkien writes a letter to Hans-Jörg Modlmayr.
- 1972 - Tolkien writes Letter 333.
- 2004 - The World of Tolkien is published.