John Chapman Ostlund (September 29 1927 – April 27 2004) was a diversified businessman from Gillette and Cheyenne Wyoming who served in the Wyoming State Senate from 1973 to 1978 when he resigned to seek the Republican gubernatorial nomination. As the GOP nominee he came within 1 percentage point of unseating Democratic Governor Edgar Herschler of Kemmerer in Lincoln County in western Wyoming. Ostlund lost his sight in 1985 because of complications from diabetes.