Godmanchester is a township municipality located in Le Haut-Saint-Laurent Regional County Municipality in the Montérégie region of Quebec, Canada. The population as of the 2021 Canadian census was 1,403 The southeast part of the township is mostly delineated by the Châteauguay River, while the south end borders with Franklin County, New York. It was named after Godmanchester, England, in 1811.