Pierre Baillargeon (November 8, 1812 – December 15, 1891) was a physician and political figure in Quebec. He sat for Stadacona division in the Senate of Canada from 1874 to 1891. He was born in , Lower Canada, the son of François Baillargeon and Marie-Louise Langlois dit Saint-Jean, and was educated at the Collège de Nicolet. Baillargeon received an MD from Harvard University. He was a member of the Boston Medical Society and a visiting physician at the Quebec General Hospital in Quebec City. In 1842, he married Geneviève, the daughter of . Baillargeon died in office at the age of 79.