A townhouse, townhome, town house, or town home, is a type of terraced housing. A modern townhouse is often one with a small footprint on multiple floors. In a different British usage, the term originally referred to any type of city residence of someone whose main or largest residence was a country house.

A terrace, terraced house (UK), or townhouse (US) is a kind of medium-density housing that first started in 16th century Europe with a row of joined houses sharing side walls. In the United States and Canada these are sometimes known as row houses or row homes.