Tariffville is a neighborhood and census-designated place (CDP) in the town of Simsbury in Hartford County, Connecticut, United States. The population was 1,324 at the 2010 census. It is a popular location for whitewater paddlers who use the Farmington River.
Part of the original mill village area is included in the Tariffville Historic District, listed on the National Register of Historic Places. The historic district excludes newer development around West Point Terrace and Hayes Road, as well as properties along White Water Turn, Wooster Road, and Main Street Extension. The historic district is architecturally significant for preserving some evidence of early nineteenth century mill village characteristics (in retaining some old mill housing and street layout) and for also preserving later 19th century Greek Revival and Gothic Revival structures.