Darren O'Shaughnessy is an Irish writer and novelist. He is best known for his young adult fiction series The Saga of Darren Shan, The Demonata, and Zom-B, published under the pseudonym Darren Shan. The former was adapted into a manga series from 2006 to 2009 as well as a live-action film in 2009, with a prequel series, The Saga of Larten Crepsley, being released from 2010 to 2012.

O'Shaughnessy has published other children's books as Darren Shan, including Koyasan, and The Thin Executioner. From 2020 to 2022, he self-published his latest young adult series Archibald Lox.