Events that occurred on 10 April
 On Earth
- 1918 - J.R.R. Tolkien attends a medical board examination. He is found to be fit for general service.
- 1943 - Mucisian Bo Hansson is born.
- 1958 - J.R.R. Tolkien writes Letter 208.
- 1969 - J.R.R. Tolkien writes a a letter to Mrs Mroczkowska.
- 1991 – The Revised Edition of Karen Wynn Fonstad's The Atlas of Middle-earth is published.