| Donald W. MacKay | |
| Birth Date: | 3 January 1874 |
| Birth Place: | Santa Rosa, California |
| Death Place: | Liverpool, Nova Scotia |
| Office: | MLA for Queens |
| Term Start: | 1928 |
| Term End: | 1933 |
| Predecessor: | Frank J.D. Barnjum |
| Successor: | Seth M. Bartling |
| Party: | Liberal-Conservative |
| Occupation: | tailor |
Donald Willard MacKay (January 3, 1874 – January 26, 1952) was a Canadian politician. He represented the electoral district of Queens in the Nova Scotia House of Assembly from 1928 to 1933. He was a Liberal-Conservative member.[1]
MacKay was born in 1874 at Santa Rosa, California, and moved to Nova Scotia in 1877.[2] He married Reta Cook, and was a tailor by career.[2] MacKay served as mayor and town councillor in Liverpool, Nova Scotia.[2] MacKay entered provincial politics in 1928 when he was elected in the dual-member Queens County riding with William Lorimer Hall.[3] He did not reoffer in the 1933 election.[1] MacKay died at Liverpool on January 26, 1952.[2]