Events that occurred on 21 January.
On Earth
- 1889 – Edith Bratt is born in Gloucestershire.
- 1913 – Actor Heron Carvic is born.
- 1934 - J.R.R. Tolkien writes Letter 8a.
- 1945 – Actor Martin Shaw is born.
In Arda
- T.A. 3019:
- The Fellowship of the Ring rests in Lothlórien.