Pierre Grenier was a politician from Quebec, Canada and a Member of the Legislative Assembly of Quebec (MLA).
[1] He was born on June 11, 1837, in Trois-Rivières, Mauricie, Lower Canada and was a physician.
He ran as a Conservative candidate in the district of in the provincial district of Champlain in 1890 and won with the backing of local Catholic Bishop Louis-François Richer Laflèche.
He succeeded Parti National incumbent Ferdinand Trudel.
He was succeeded by Liberal Pierre-Calixte Neault.