Villeneuve was elected to the Ontario legislature in a by-election held on December 15, 1983, called after the death of Osie Villeneuve no relation. Running in the riding of Stormont—Dundas—Glengarry, he defeated Liberal candidate Johnny Whitteker by more than 4,000 votes. He was re-elected by about the same margin in the 1985 provincial election. He endorsed Dennis Timbrell for the party leadership in 1985. The Progressive Conservative government of Frank Miller was re-elected in the 1985 election, but was reduced to minority status. Villeneuve was appointed to cabinet as a minister without portfolio on May 17, 1985. The PC government was short-lived and was defeated in the house a month later. For the party's November 1985 leadership convention, he shifted his support from Timbrell to Larry Grossman. In the 1987 election, Villeneuve defeated his Liberal opponent by only 607 votes. He was re-elected by a greater margin in the 1990 election, and won a landslide victory in the 1995 election as his party returned to power with a majority government. Villeneuve was appointed Minister of Agriculture, Food and Rural Affairs with responsibility for Francophone Affairs on June 26, 1995. He held these positions until the 1999 election. Villeneuve was not regarded as one of the more right-wing figures in the Harris cabinet, though his government presided over considerable funding cutbacks in the agriculture department and the elimination of local representatives. However, Villeneuve made his mark during the 1998 Eastern OntarioIce Storm where he provided farmers with funding to purchase necessary generators to keep their farms afloat and most importantly, to enable farmers to continue milking their cows during the lengthy power outage. His efforts as Minister of Agriculture, Food and Rural Affairs didn't go unnoticed. The ministry became one of the top ministries under his reign as Minister. In 1996, the Harris government reduced the number of provincial ridings from 130 to 103. This change meant that a number of sitting Members of Provincial Parliament had to compete against one another for re-election. Villeneuve faced incumbent Liberal John Cleary in the new riding of Stormont—Dundas—Charlottenburgh, and lost by only 562 votes in a closely watched contest.
Cabinet positions
After politics
In 2000, Villeneuve was appointed a Justice of the Peace. However he suffered a non-fatal but severe stroke in 2002. He resided at home with his wife Elaine as his caregiver for approximately 14yrs, then moved to the Maxville Manor where he resided for 2yrs prior to his death on Feb. 28, 2018.
