Steven Ainsworth Lonergan (29 March 1899 – June 1969) was an Australian public servant, who spent most of his career in the Territory of Papua and New Guinea. He served in the Legislative Council from 1952 to 1959.

Biography Lonergan was born in Hobart in Tasmania in March 1899,Ian Downs (1999) The New Guinea Volunteer Rifles, NGVR, 1939-1943: A History, p150 and was educated at State High School in Launceston.Who's who in Australia, Volume 14, p434 He joined the Australian armed forces during World War I and saw action the Battle of Gallipoli aged only 16 and later in France, where he was badly injured. He then served in the Australian army headquarters in London. After the war he studied at the Repatriation Trades School in Launceston from 1920 to 1922, before joining the civil service in the Territory of New Guinea in 1923. He married Norfolk Islander Irene Mitchell in February 1929.

In 1940 he was appointed Assistant Government Secretary. During World War II he was part of the Australian New Guinea Administrative Unit, achieving the rank of lieutenant-colonel and was mentioned in dispatches.Heroes of the territories Pacific Islands Monthly, October 1945, p7 He became Acting Government Secretary in 1949, and in 1951 took on the role permanently.Papua-New Guinea administration Pacific Islands Monthly, September 1951, p12 As a result, he was appointed to the Legislative Council in 1952.P-NG Legislative Council Pacific Islands Monthly, March 1952, p56

The Secretary Department was scrapped in 1955 and Lonergan became Director of Civil Affairs. He was also Acting Assistant Administrator for five months in 1956–57.Dr. J.T. Gunther Pacific Islands Monthly, March 1957, p21 He retired in 1959 and returned to Australia. He died in Sydney in 1969, survived by his wife.Mr. S.A. Lonergan Pacific Islands Monthly, July 1969, p125

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