Pierre H. Cadieux, PC (born April 6, 1948) is a lawyer and former Canadian politician.

Born in Hudson, Quebec, Cadieux was first elected to the House of Commons of Canada as the Progressive Conservative Member of Parliament for Vaudreuil, Quebec in the 1984 federal election that brought Brian Mulroney to power.

In 1986, he was appointed to the Canadian Cabinet as Minister of Labour, and in 1989, was moved in a cabinet shuffle to Minister of Indian Affairs and Northern Development. In 1990, he was shuffled again to the position of Solicitor-General of Canada, and in 1991, he became Deputy Government House Leader and Minister of State for Fitness and Amateur Sport and for Youth.

Cadieux left Cabinet when Mulroney retired as Prime Minister, and did not run in the 1993 federal election.

Parliament of Canada Preceded byHal Herbert Member of Parliament for Vaudreuil1984–1993 Succeeded byNick Discepola Political offices Preceded byWilliam Hunter McKnight Minister of Indian Affairs and Northern DevelopmentJanuary 30, 1989 – February 22, 1990 Succeeded byThomas Edward Siddon Preceded byPierre Blais Solicitor General of CanadaFebruary 23, 1990 – April 20, 1991 Succeeded byDouglas Grinslade Lewis Preceded byMarcel Danis Deputy Leader of the Government in the House of CommonsApril 21, 1991 – June 24, 1993 Succeeded byAlfonso Gagliano Preceded byMarcel Danis Progressive Conservative Party Deputy House LeaderApril 21, 1991 – June 24, 1993 Succeeded byBill Matthews