Derek Landy (born 23 October 1974) is an Irish author and screenwriter, known for the Skulduggery Pleasant and Demon Road book series.

Landy has written two screenplays that have been made into films, the IFTA award-winning Dead Bodies and the IFTA-nominated Boy Eats Girl starring Samantha Mumba.

[citation needed] Frustrated with the collaborative process of filmmaking, Landy moved on to writing the Skulduggery Pleasant series, starting with the novel of the same name.

[4] Landy is a fan of Joss Whedon's works, notably Buffy the Vampire Slayer, as well as Philip Pullman's His Dark Materials series.

In a review of his first book, Skulduggery Pleasant, Sarah Webb of the Irish Independent wrote that it "is taut, full of zippy dialogue and fantastical visuals".