Philip Sassoon Conservative Rupert Brabner Conservative The 1939 Hythe by-election was a parliamentary by-election held on 20 July 1939 for the British House of Commons constituency of Hythe.

The vacancy was caused by the death of the Conservative MP, Sir Philip Sassoon, 3rd Baronet.

Rupert Brabner served as a junior Government Minister.

Frank Darvall had planned to contest Hythe at a 1939 or 1940 general election, but never stood for Parliament again.

St. John Philby also disappeared from the electoral scene along with the British People's Party, which never contested an election again.