| Alexander David Stewart | |
| Order: | Mayor of Hamilton, Ontario |
| Term Start: | 1894 |
| Term End: | 1895 |
| Predecessor: | Peter Campbell Blaicher |
| Successor: | George Elias Tuckett |
| Birth Date: | 19 September 1852 |
| Birth Place: | Leghorn, Grand Duchy of Tuscany |
| Death Place: | Somewhere Island, Yukon |
| Restingplace: | Somewhere Island, Yukon |
| Spouse: | Emily Mary Otter (1878) |
| Profession: | Chief of Police |
| Alma Mater: | University of Edinburgh |
Alexander David Stewart (September 19, 1852 - March 13, 1899) was mayor of Hamilton, Ontario, from 1894 to 1895.
Stewart was born in Leghorn, Grand Duchy of Tuscany. He trained as a medical doctor at University of Edinburgh, but he never practiced as a doctor. He also studied with Joseph Lister at Aberdeen.
He married Emily Mary Otter in 1878.
He served as Chief of Hamilton Police in Hamilton for six years. In 1885, he was sent to act as Marshall of the Court for the Trial of Louis Riel. Electricity was installed in City Hall during his two-year term. In 1898, he joined an expedition to the Yukon gold fields. He died of scurvy on Somewhere Island, Yukon, at the confluence of the Peel and Beaver Rivers, March 13, 1899, and was buried there.