| David B. Mullen | |
| Birth Date: | 4 November 1885 |
| Death Place: | Edmonton, Alberta, Canada |
| Birth Place: | Peterborough, Ontario, Canada |
| Office: | Member of the Legislative Assembly of Alberta |
| Constituency: | Edmonton |
| Term Start: | 1935 |
| Term End: | 1940 |
| Party: | Social Credit |
David Bertram Mullen (November 4, 1885 – October 28, 1940) was a provincial politician from Alberta, Canada. He served as a member of the Legislative Assembly of Alberta from 1935 to 1940, sitting with the Social Credit caucus in government. He served as the Minister of Agriculture from 1937 until his death in 1940 from a heart attack.[1] [2]