Donald Morris McGregor (April 25, 1923 – July 25, 2003) was a politician in Manitoba, Canada. He was a Progressive Conservative member of the Legislative Assembly of Manitoba from 1962 to 1981.
McGregor was born in Lenore, Manitoba. The son of Donald (Dan) and Mabel McGregor, he was educated in Lenore schools, and served in the Royal Canadian Navy. McGregor later owned a farm in Kenton, Manitoba and became a freemason. He served as a member of the Kenton Chamber of Commerce. In 1954, he married Helen Large of Roblin, Manitoba.
McGregor was re-elected by more comfortable majorities in the elections of 1973 and 1977 Manitoba general election.