Jon Rieder Grunseth (born November 11, 1945) is a Minnesota businessman and politician. He was the 1990 Independent-Republican nominee for Governor of Minnesota. Grunseth won his party's endorsement and its primary election, but was forced to quit the race nine days before election day in the wake of a scandal. Until the 1990 governor's race, Grunseth had been the Vice President of Public Affairs at Ecolab, and chair of the Chemical Specialties Manufacturers Association.