Andrew Noel Griffiths (born 3 September 1961) is an Australian children's book author and comedy writer. He is most notable for his "Just!" series, which was adapted into an animated television series called "What's with Andy?", his novel "The Day My Bum Went Psycho", which was also adapted into a television series, and the "Treehouse" series, which has been adapted into several stage plays. Previously a vocalist with alternative rock bands Gothic Farmyard and Ivory Coast, in 1992 he turned to writing. He is well known for working with Terry Denton. Griffiths is noted as a supporter of children against what he views as "cotton wool" childhoods, and, along with Denton, was a noted supporter of the September 2019 climate strikes.