Arnold Spencer Leese (16 November 1878 – 18 January 1956) was a British veterinarian and fascist politician. He joined the British Fascists. In 1928, Leese established the Imperial Fascist League. Leese declared loyalty to Britain at the start of WWII, but was imprisoned under Defence Regulation 18B regardless.
After his death, his widow, May Winifred Leese (died 1974), helped fund some nationalist groups. His London house, 74 Princedale Road, Holland Park, was left to Colin Jordan, and became known as 'Arnold Leese House'. The property became Jordan's base of operations.