Guy Gavriel Kay is a Canadian author of fantasy fiction, born on November 7, 1954. He is renowned for crafting novels set in fictional realms that closely resemble real historical periods and locations, such as Constantinople during the reign of Justinian I or Spain during the era of El Cid. While his works are often published and marketed as historical fantasy, Kay himself prefers to avoid strict genre categorization whenever possible.

As of 2022, Kay has published 15 novels and a book of poetry, and by 2018, his fiction had been translated into at least 22 languages. In addition to his literary achievements, Kay is also a qualified lawyer in Canada.