Guy Gavriel Kay CM (born November 7, 1954) is a Canadian writer of fantasy fiction.

Kay has expressed a preference to avoid genre categorization of these works as historical fantasy.

[2] Kay returned to Canada in 1975 to pursue a law degree at the University of Toronto, which he obtained in 1978; he was called to the bar of Ontario in 1981.

[3][2] Kay became principal writer and an associate producer for the CBC Radio series The Scales of Justice, and continued as principal writer when the series transferred to television as Scales of Justice.

[3] Kay's first novel, the portal fantasy The Summer Tree that serves as the first volume of his Fionavar Tapestry trilogy, was published in 1984.