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

Cadieux was first elected to the Canadian House of Commons 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 apointed 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 as well as Minister of State for Fitness and Amateur Sport and for Youth.

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