Events that occurred on 9 April.
 On Earth
- 1802 - Philologist Elias Lönnrot, who compiled the Kalevala, is born.
- 1902 - Inkling Lord David Cecil is born.
- 1949 - Voice actor Sorcha Cusack is born.
- 1957 - J.R.R. Tolkien writes a letter to Mr Hayward.
- 1973 – W.H. Lewis, Inkling and brother of C.S. Lewis, dies.