| Term Start: | 1963 |
| Term End: | 1965 |
| Riding: | Shelburne - Yarmouth - Clare |
| Predecessor: | Felton Legere |
| Successor: | John Oates Bower |
| Birth Date: | November 19, 1907 |
| Birth Place: | Bell Neck, Nova Scotia, Canada |
| Death Date: | November 2, 1990 |
| Profession: | automobile dealer, office manager, real estate agent |
| Party: | Liberal |
Frederick Thomas Armstrong (November 19, 1907 in Bell Neck, Nova Scotia, Canada – November 2, 1990) was a Canadian politician, automobile dealer, office manager and real estate agent. He was elected to the House of Commons of Canada in 1963 as a Member of the Liberal Party to represent the riding of Shelburne - Yarmouth - Clare. He also ran in the elections of 1962 and 1965 but lost both.