Peter Soyer Beagle is an American novelist and screenwriter, especially of fantasy fiction. His best-known work is The Last Unicorn (1968) which Locus subscribers voted the number five "All-Time Best Fantasy Novel" in 1987. During the last twenty-five years he has won several literary awards, including a World Fantasy Award for Life Achievement in 2011. He was named Damon Knight Memorial Grand Master by SFWA in 2018.

The Last Unicorn is a fantasy novel by American author Peter S. Beagle and published in 1968, by Viking Press in the U.S. and The Bodley Head in the U.K. It follows the tale of a unicorn, who believes she is the last of her kind in the world and undertakes a quest to discover what has happened to the other unicorns. It has sold more than six million copies worldwide since its original publication, and has been translated into at least twenty-five languages.