John Stuart Hans Plohman (born May 11, 1948) is a former politician from Manitoba, Canada. He was a member of the Legislative Assembly of Manitoba from 1981 to 1995, and a cabinet minister in the NDP government of Premier Howard Pawley from 1982 to 1988.
The son of Hans W. Plohman and Anne Werstiuk, he was educated at the University of Manitoba, University of Winnipeg, and Red River Community College. He worked as a teacher before entering public life. In 1980, he was elected a municipal councillor in the town of Dauphin.
Plohman was elected to the Manitoba legislature in the provincial election of 1981 as a New Democrat, He entered cabinet on August 20, 1982, serving as Minister of Government Services with responsibility for the Manitoba Telephone Act. Following a cabinet shuffle on November 4, 1983, he became Minister of Highways and Transportation. On January 30, 1985, he was also named Minister of Government Services. Despite this Plohman was re-elected in the following election, In 2004 he was appointed to the Board of Directors of the Churchill Gateway Development Corporation.
In 2005, Plohman was appointed as the first Chairman of the Board of the newly formed Manitoba Agriculture Services Corporation (MASC). In this capacity Plohman provided leadership in the amalgamation of the former Manitoba Agriculture Credit Corporation (MACC) and the Manitoba Crop Insurance Corporation (MCIC) into the dynamic MASC serving the lending and insurance needs of rural Manitobans.