Tariffville is a neighborhood and census-designated place (CDP) in the town of Simsbury in Hartford County, Connecticut, United States.

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.

Tariffville is in the northeastern corner of the town of Simsbury, on the inside of a sharp bend in the Farmington River.

The southeastern border of the CDP follows the crest of Talcott Mountain and is the town line with Bloomfield.

The southern border of the CDP follows a line just south of West Point Terrace, from Talcott Mountain back down to the river.

[1] In 1825 (or 1827),[2] the Tariff Manufacturing Company built a carpet mill along the Farmington River, giving its name to the area.

[5] The carpet business survived for a few decades, but by 1867, the primary industry in the area was sorting and packing of tobacco.