John Stuart Plohman (born May 11, 1948) is a politician in Manitoba, Canada. He was a member of the Legislative Assembly of Manitoba from 1981 to 1995, and a cabinet minister in the government of Premier Howard Pawley from 1982 to 1988.
Plohman was educated at the University of Manitoba 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, defeating incumbent Progressive Conservative Jim Galbraith by 636 votes in the central-northern riding of Dauphin. 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 .
Plohman was re-elected by an increased margin in the 1986 provincial election. He stepped down as Minister of Government Services on February 4, 1987, and September 21, 1987 was transferred from Transportation to the Ministry of Natural Resources .
The Manitoba NDP were defeated in parliament in early 1988, when disgruntled backbench MLA Jim Walding voted against his government's budget. Plohman was re-elected by a narrow margin in the following election, defeating Progressive Conservative Russell Secord by 548 votes. The NDP were reduced to 12 seats (out of 57) and third-party status following this election; Plohman formally resigned his cabinet portfolio on May 9.
The NDP recovered to twenty seats in the provincial election of 1990, and Plohman was re-elected with a somewhat increased majority. He did not seek re-election in 1995.
In 2002, Plohman was appointed to a provincial advisory board recommending ways to stimulate economic growth at the Port of Churchill, in northern Manitoba.