Events that occurred on 29 March.
 On Earth
- 1939 - J.R.R. Tolkien does the third and final day of his training with the top-secret Government Code and Cypher School (GCCS) at their London headquarters.
- 1981 - The fourth episode of the 1981 radio series of The Lord of the Rings is aired on BBC Radio 4.
- 2000 - Tyalië Tyelelliéva issue 14 is published.
- 2012 - Author Jan Broberg dies.