| John Turnbull | |
| Office: | Member of the Legislative Assembly of New Brunswick |
| Predecessor: | none, first member |
| Successor: | Louis Murphy |
| Term Start: | 1974 |
| Term End: | 1978 |
| Constituency: | Saint John Harbour |
| Birth Name: | John Wallace Turnbull |
| Birth Date: | 8 January 1936 |
| Birth Place: | Montreal, Quebec, Canada |
| Death Place: | New Brunswick, Canada |
| Spouse: | Kathryn Maude Mutch |
| Party: | New Brunswick Liberal Association |
| Occupation: | lawyer |
| Children: | 3 |
John Wallace Turnbull (January 8, 1936 – May 19, 2020) was a Canadian politician, lawyer and judge. He served in the Legislative Assembly of New Brunswick from 1974 to 1978 as a Liberal member from the constituency of Saint John Harbour.[1] He was appointed to the Supreme Court of New Brunswick (Court of Queen's Bench) in 1983.[2]