Celia Rees (born 1949) is an English author of children's, YA and Adult fiction.

She was born in 1949 in Solihull, West Midlands but now lives in Leamington Spa with her husband. Rees attended University of Warwick and earned a degree in History of Politics. After university, she taught English in Coventry secondary schools for seventeen years, during which time she began to write.

Since then, she has written over twenty YA titles. Her books have been translated into 28 languages. She has been short listed for the Guardian, Whitbread (now Costa) and W.H. Smith Children’s Book Awards. She is a regular tutor for the Arvon Foundation. She has been Chair of the Children’s Writers and Illustrators Group and on the Society of Authors’ Management Committee.

Her first book for adults, Miss Graham's Cold War Cookbook, was published by HarperCollins in July, 2020.