| Marcus Lorne Jewett | |
| Office: | Member of the Legislative Assembly of New Brunswick |
| Term Start: | 1931 |
| Term End: | 1935 |
| Constituency: | York |
| Birth Date: | 19 January 1888 |
| Birth Place: | York County, New Brunswick |
| Death Place: | Fredericton, New Brunswick |
| Spouse: | Anna Myrtle Lawrence |
| Party: | Progressive Conservative Party of New Brunswick |
| Occupation: | physician, surgeon |
| Children: | two |
| Residence: | Melville, New Brunswick |
Marcus Lorne Jewett (January 19, 1888 – October 8, 1955) was a Canadian politician. He served in the Legislative Assembly of New Brunswick as member of the Progressive Conservative party representing York County from 1931 to 1935.[1]