Events that occurred on 27 May.
 On Earth
- 1922 – Actor Christopher Lee is born.
- 1930 - The University Press of Oxford sends J.R.R. Tolkien a copy of A Middle English Reader.
- 1932 - J.R.R. Tolkien writes a letter to A.F. Colborn.
- 1958 - J.R.R. Tolkien writes a letter to Nancy Smith.