Alexander Leslie Rigby AM ED (30 January 1916 - 2 January 2001) was an Australian builder and company director.
Rigby was born in Sydney, New South Wales, and attended Newington College (1929–1933) and Sydney Technical College.
Having been a school cadet prior to joining the 55/53rd Battalion in 1937, Rigby was commissioned in January 1939. He went to Darwin, Northern Territory, on the SS Zealandia in February 1941 to join the Darwin Infantry Battalion, that absorbed the Darwin Mobile Force. Rigby was elected the first president of the Darwin Infantry Battalion Association.