Cathy Cassidy (born 13 June 1962) is a British author of young adult fiction, mainly focusing on domestic fiction. She was born in Coventry, but now lives in the Galloway hills in Scotland. She has written 23 books. She has also been the agony aunt for Shout, a magazine for teenage girls, and she presently has a series of three books about Daizy Star for younger readers.
Cassidy now lives in the Galloway hills in Scotland with husband and two children. She has been a vegetarian for over 35 years, and was a vegan for 8 years. Her lurcher, Kelpie, inspired the dog Legg-It in her first book. Cassidy was the agony aunt on teenage Shout magazine for 12 years and for many years taught art in local primary schools. She attended university to take an art degree. She has drawn all the illustrations and the front covers to all the Daizy Star books.
Cassidy has three times been nominated for the Queen of Teen award, in 2008 (when it was founded), 2010 and 2012. Authors have included Sarah Webb, Louise Rennison (the 2008 winner)) and Sarra Manning. In 2010, fans voted Cassidy as the winner. In 2012, she was a runner up to Maureen Johnson.