Sir Thomas Austin, KCIE (20 July 1887 – 27 June 1976) was a British civil servant of the Indian civil service and administrator who served as the Diwan of Travancore from 1932 to 1934.

Thomas Austin entered the Indian Civil Service in 1910 and served in various junior positions before being appointed District Collector of Nilgiris in 1929.

He served as Collector of Nilgiris from 1929 to 1932 when he was appointed the Diwan of Travancore on a two-year contract.

In his later life, Austin also served as Chief Secretary of the Government of Madras.

Austin was made a Knight Commander of the Order of the Indian Empire in 1945.