Donald Cromwell McDonald (November 17, 1879[1] – October 3, 1917[2]) was a politician in Manitoba, Canada.

He served in the Legislative Assembly of Manitoba from 1914 to 1915 as a member of the Liberal Party.

McDonald was born in Bruce County, Ontario, the son of Roger McDonald and Mary Cameron,[3] and was educated at Port Elgin and Owen Sound.

The Conservatives won the election, and McDonald sat with his party in opposition.

The Conservative administration of Rodmond Roblin was forced to resign from office in 1915, amid a serious corruption scandal.