Ruth Jones was born in Bridgend, South Wales in 1966. She went to Porthcawl Comprehensive then studied drama at Warwick University before training as an actor at the Royal Welsh College of Music and Drama. Her first acting job was playing Countess Almaviva in Beaumarchais' The Marriage of Figaro, directed by Dominic Cooke. Ruth then went on to work at the National Theatre and the RSC.
Her subsequent screen credits include East Is East, Emma, Little Britain, Nighty Night and Fat Friends, where she met James Corden. Together they created and wrote three series of the BBC1 hit Gavin and Stacey, in which Ruth also played the infamous Nessa Shanessa Jenkins. In 2008 Ruth set up Tidy Productions with her producer husband David Peet. They co-created Stella for Sky 1, which is now into its fifth season. As well as writing several episodes of Stella and playing the titular role, Ruth's TV writing credits include episodes of Kay Mellor's The Chase and Fat Friends. She has also written two short stories for radio — Polly Garter Was My Great Gran and Blue Line in a Box — as well as co-writing a radio play, The Cyhiraeth.
Ruth lives in Cardiff. Her first novel Never Greener was a number one bestseller and her second novel, Us Three published in 2020.