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.

[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".

[8] Playing with Fire, Mortal Coil and Last Stand of Dead Men each won the senior Irish Children's Book Award, in 2009, 2010 and 2013.