Joseph-Philippe Guay, PC (October 4, 1915 – July 30, 2001) was a Canadian parliamentarian, serving as a member of the Liberal Party.
He won the St. Boniface Liberal nomination in the buildup to the 1968 federal election over the sitting member, cabinet minister Roger-Joseph Teillet.
Guay campaigned on the fact that he, unlike Teillet, had supported Pierre Elliott Trudeau on every ballot of the 1968 Liberal Party of Canada leadership convention.
In 1978, he was appointed to the Senate representing the senatorial division of St. Boniface, Manitoba.
In 1957, he was knighted as a member of the Order of Saint Gregory the Great by Pope Pius XII.