St. Johnsville is a village in Montgomery County, New York, United States. The population was 1,732 at the 2010 census. Accounts vary as to what the name is derived from, but most accounts credit Alexander St. John, an early surveyor and commissioner, and still others credit an early name for the area, St. John's Church.
The Village of St. Johnsville is in south part of the Town of St. Johnsville and lies between Utica and Amsterdam. In 2019 almost the entire village was listed on the National Register of Historic Places as the St. Johnsville Historic District.