Sir John Sandeman Allen (26 September 1865 – 3 June 1935) was a British Conservative Party politician. He was a Member of Parliament (MP) for Liverpool West Derby from 1924 until he died in office in 1935.
. F. W. S. Craig . British parliamentary election results 1918–1949 . 1969 . 3rd . 1983 . Parliamentary Research Services . Chichester . 0-900178-06-X.