| John D. Alexander | |
| Office: | Member of the Legislative Assembly of New Brunswick |
| Term Start: | 1960 |
| Term End: | 1963 |
| Constituency: | Restigouche |
| Birth Date: | 22 August 1903 |
| Birth Place: | Campbellton, New Brunswick |
| Death Place: | New Brunswick |
| Spouse: | Ruth Munroe Anslow |
| Party: | New Brunswick Liberal Association |
| Occupation: | druggist |
John Dow Alexander (August 22, 1903 – June 23, 1994) was a Canadian politician. He served in the Legislative Assembly of New Brunswick from 1960 to 1963 as member of the Liberal party.[1]