Template:Month Events that occurred on 21 May.
On Earth
- 1944 – J.R.R. Tolkien writes Letter 70.
- 1951 - Artist Angelo Montanini is born.
- 2000 – The message-board Minastirith.com goes online.
- 2011 – Unquendor's Lustrumfeest.
- 2011 – The Tolkien Society's Middle-earth Weekend in Sarehole, Birmingham.
- 2013 - The Fall of Arthur is published.
In Arda
- The are no known events for this day.fi:21. toukokuuta