| James W. Brittain | |
| Office: | Member of the Legislative Assembly of New Brunswick |
| Term Start: | 1948 |
| Term End: | 1952 |
| Constituency: | Saint John City |
| Order2: | 51st |
| Office2: | Mayor of Saint John, New Brunswick |
| Predecessor2: | Walter W. White |
| Successor2: | David Laurence MacLaren |
| Term Start2: | 1932 |
| Term End2: | 1936 |
| Birth Date: | 8 February 1886 |
| Birth Place: | Saint John, New Brunswick |
| Death Place: | Lorneville, New Brunswick |
| Spouse: | Annie Thomas Marion Gertrude Christie |
| Party: | New Brunswick Liberal Association |
| Occupation: | steamship agent, broker, weigher, sampler |
| Children: | 3 |
James Wetmore Brittain (February 8, 1886 – March 12, 1961) was a Canadian municipal and provincial politician. He served as the mayor of Saint John from 1932 to 1936, and he served in the Legislative Assembly of New Brunswick as member of the Liberal party from 1948 to 1952.[1]
Brittain died at the age of 75 on March 12, 1961, having suffered a heart seizure while driving.[2]