The Waterloo Manufacturing Company, Ltd. was a Canadian farm engine builder based in Waterloo, Ontario, which built engines in sizes ranging from sixteen to thirty horsepower between 1880 and 1925. Waterloo Manufacturing of Ontario is occasionally confused with the Waterloo Gasoline Engine Company, of Waterloo, Iowa, U.S., which was purchased by John Deere for its popular Waterloo Boy Tractor. No relationship between the companies exists.