Portrait of M. Gilbert de Voisins, Councillor of State in Ordinary, 1761
Guillaume Voiriot (1713 – 30 November 1799) was a French portrait painter.
Voiriot was born in Paris. In the years 1746–1749 Voiriot went, at his own expense, to Italy. After his return he became a member of the painters and sculptors guild at Académie de Saint-Luc. In the years 1759 to 1771 he regularly exhibited portraits of his contemporaries in the Paris Salon. He portrayed family members, scientists, writers, actors and musicians. He died in Paris.