| David W. Mersereau | |
| Office: | Member of the Legislative Assembly of New Brunswick |
| Alongside: | Robert Black Smith |
| Term Start: | 1917 |
| Term End: | 1925 |
| Constituency: | Sunbury |
| Birth Date: | 16 February 1868 |
| Birth Place: | Fredericton Junction, New Brunswick |
| Death Place: | Fredericton Junction, New Brunswick |
| Party: | New Brunswick Liberal Association |
| Occupation: | Farmer |
| Children: | 5 |
David Wellington Mersereau (February 16, 1868 – December 13, 1958) was a Canadian politician. He served in the Legislative Assembly of New Brunswick from 1917 to 1925 as member of the Liberal party.[1] He died in 1958, aged 90.[2]