| Bill Armstrong | |
| Honorific-Suffix: | OBE, MC |
| Constituency Mp: | Riverina |
| Parliament: | Australian |
| Predecessor: | Hugh Roberton |
| Successor: | Al Grassby |
| Term Start: | 27 February 1965 |
| Term End: | 25 October 1969 |
| Birth Date: | 1909 7, df=yes |
| Birth Place: | Deniliquin, New South Wales, Australia |
| Nationality: | Australian |
| Party: | Australian Country Party |
| Occupation: | Farmer |
Adam Alexander "Bill" Armstrong, OBE, MC (1 July 1909 – 22 February 1982) was an Australian politician. Born in Deniliquin, New South Wales, he was a grazier before serving in the military 1939–45 (during World War II). 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.[1]