Peter McGregor Campbell (February 9, 1872 – September 19, 1954) was a Canadian physician and provincial politician from Alberta.

He was educated at Renfrew High School and later attended Queen's University at Kingston where he completed his medical studies in 1896.

Campbell entered provincial politics by contesting and winning the Lethbridge electoral district in a 1937 by-election following the controversial resignation of Hans Wight.

[3] Campbell was elected as a member of the Independent Citizen's Association which opposed the policies of the governing Social Credit party.

Campbell was subsequently re-elected 1940 Alberta general election defeating Social Credit candidate A. E.