Perth—Middlesex was an electoral district in Ontario, Canada, that was represented in the House of Commons of Canada from 1997 to 2003 and in the Legislative Assembly of Ontario from 1999 to 2007. This riding was created in 1996 from parts of Lambton—Middlesex, London—Middlesex and Perth—Wellington—Waterloo ridings. It consisted of: The electoral district was abolished in 2003 when it was redistributed between Elgin—Middlesex—London, Middlesex—Kent—Lambton and Perth Wellington ridings.

Members of Parliament

This riding has elected the following members of Parliament:

Election results

Federal

Provincial