Major General Arthur Samuel "Tubby" Allen, (10 March 1894 – 25 January 1959) was an Australian Army officer and accountant.
During the Second World War he reached the rank of major general and commanded Allied forces in the Syria-Lebanon and New Guinea campaigns.
Allen was frequently referred to during the Second World War by the nickname "Tubby"; an indication of his stocky build and the affection with which he was regarded by both soldiers and the Australian public.