John Sandeman Allen (30 May 1892 – 29 September 1949) was a British Conservative Party politician. He was a Member of Parliament (MP) for Birkenhead West from 1931 to 1945. At the 1945 general election he stood in the previously Conservative-held South Norfolk constituency, but the Labour candidate, Christopher Mayhew, was elected as the constituency's MP.
. F. W. S. Craig . British parliamentary election results 1918–1949 . 1969 . 3rd . 1983 . Parliamentary Research Services . Chichester . 0-900178-06-X.