Strathroy (2001 population 19,114) is a town in southwestern Ontario, Canada. In 1998 its town government merged with the outlying township of Caradoc.
Strathroy was first settled in 1832 by John Stewart Buchanan, at a spot on the Sydenham River sufficient enough to power a grist mill. It was incorporated in 1860.
Manufacturing and food processing are major industries in Strathroy.