Peter Wagner (June 6, 1916 in Fisher Branch, Manitoba – August 13, 1995) was a politician in Manitoba, Canada. He served in the Legislative Assembly of Manitoba from 1958 to 1962, at first for the Cooperative Commonwealth Federation and later for its successor party, the NDP.
Of German and Ukrainian background, Wagner was educated in Manitoba and worked as a farmer. Before entering politics, he was president of the local Cooperative Association and the Pool Association, also serving as chair of the local school board and as director of the Manitoba Farmer's Union
He was first elected to the Manitoba legislature in the 1958 provincial election, defeated incumbent Liberal-Progressive Nicholas Bachynsky by 56 votes in the mid-northern constituency of Fisher. He was re-elected by an increased margin in the 1959 election.