Pierre Malcom Guay (March 26, 1848 – February 19, 1899) was a physician, surgeon and political figure in Quebec.
He represented Lévis in the House of Commons of Canada from 1885 to 1899 as a Liberal member.
He was born in Saint-Romuald d'Etchemin, Canada East, the son of François Xavier Guay and Marie Adelaide Côté.
Guay was educated at the Séminaire de Quebec and the Université Laval, where he received a M.D..
In 1874, he married Marie Louise Antoinette Roy.
He served on the town council for St-Romuald d'Etchemin and was mayor from 1886 to 1887.
Guay was also a governor of the board of physicians and surgeons for Quebec.
He was first elected to the House of Commons in an 1885 by-election held after Isidore-Noël Belleau was unseated following an appeal.
- photographer, businessperson and pharmacist Three generations of photographers (Jules Isaï Benoît (1830-1865), Jules Ernest Livernois (1851-1933), and Jules Livernois (1877-1952)) known as "Livernois"