Pierre-Joseph-Olivier Chauveau (May 30, 1820 – April 4, 1890), born in Charlesbourg, near Quebec City, was a Canadian lawyer and politician.
Chauveau was the first Premier of the Canadian province of Quebec, following the establishment of the Dominion of Canada in 1867.
He was a lawyer by profession, and practised in Quebec City.
He was also the Minister of Education and Provincial Secretary.
Also beginning in 1867, he was simultaneously the federal Member of Parliament for the riding of Quebec County (such "double mandates" were abolished in 1874).
He resigned both his federal and provincial seats, as well the office of Premier, on February 25, 1873, following appointment as Speaker of the Senate of Canada on February 21, 1873.
He had seven children, one of whom, Alexandre Chauveau, became a provincial politician in his own right.His great-great-great-grandson is politician Thomas Mulcair.