Pierre-Alexis "Pitre" Tremblay (December 27, 1827 – January 4, 1879) was a surveyor and Quebec political figure.

He was born in La Malbaie, Lower Canada, in 1827 and studied at the Petit Séminaire of Quebec.

In 1867, he was elected to the Legislative Assembly of Quebec in Chicoutimi-Saguenay; in the same year he was elected to the House of Commons of Canada in the same riding; such dual mandates were legal at the time.

He was defeated in a by-election held in 1876 but was able to overturn this result in the Supreme Court of Canada in 1877 by demonstrating that the Quebec clergy had exerted undue influence against him during the election.

From 1862 to 1868, he was involved with Félicité Angers, better known as the author Laure Conan, but he married Mary Ellen Connoly in 1870.