Adam Alexander "Bill" Armstrong, OBE, MC was an Australian politician. Born in Deniliquin, New South Wales, he was a grazier before serving in the military 1939-45. Subsequently he became involved in local politics, serving on Conargo Shire Council. In 1965 he was elected to the Australian House of Representatives in the by-election for the seat of Riverina that followed the resignation of Hugh Roberton; Armstrong was a member of the Country Party. He held the seat until 1969, when he was defeated by Labor's Al Grassby. Armstrong died in 1982.