Farah Jane Mendlesohn (born 27 July 1968) is a British academic historian, writer on speculative fiction, and active member of science fiction fandom. Mendlesohn is best-known for their 2008 book , which classifies fantasy literature into four modes based on how the fantastic enters the story. Their work as editor includes the Cambridge Companions to science fiction and fantasy, collaborations with Edward James. The science fiction volume won a Hugo Award. Mendlesohn is also known for books on the history of fantasy, including Children's Fantasy Literature: An Introduction, co-written with Michael Levy. It was the first work to trace the genre's 500-year history and won the World Fantasy Award.