Simon Guerrier (born June 1976) is a British science fiction author and dramatist, closely associated with the fictional universe of Doctor Who and its spinoffs. Although he has written three Doctor Who novels, for the BBC Books range, his work has mostly been for Big Finish Productions' audio drama and book ranges. Guerrier has also written tie-in books for the Being Human and Primeval television series and co-authored a reference book for the Buffy the Vampire Slayer television series.