| Donald Morrison MacKay | |
| Office: | Member of the Legislative Assembly of British Columbia |
| Predecessor: | Roderick MacKenzie |
| Successor: | Louis LeBourdais |
| Term Start: | 1933 |
| Term End: | 1937 |
| Constituency: | Cariboo |
| Birth Date: | 9 October 1889 |
| Birth Place: | Goderich, Ontario |
| Death Place: | Ottawa, Ontario |
| Spouse: | Marion Campbell Kenning |
| Party: | British Columbia Liberal Party |
| Occupation: | land surveyor |
| Residence: | Williams Lake, British Columbia |
Donald Morrison MacKay (October 9, 1889 - May 19, 1953) was a Canadian politician. He served in the Legislative Assembly of British Columbia from 1933 to 1937 from the electoral district of Cariboo, a member of the Liberal party.[1] He resigned in 1937 to become Commissioner of Indian Affairs for British Columbia.