Sir Alfred Henry Lionel Leach CIE PC, KC (3 February 1883 – 26 January 1960), popularly known as Sir Lionel Leach, was a British judge who served as a judge of the Rangoon High Court from 1933 to 1937, Chief Justice of the Madras High Court from 1937 to 1947 and a member of the Judicial Committee of the Privy Council from 1949 to 1960.