Katherine Glyn Kessey (born 28 January 1946) is an Australian actress. She is the wife of British actor Bill Treacher. Their son Jamie Treacher is also an actor. She was born in Perth, Western Australia, with her father, Gwilym Kessey, having played cricket for Western Australia. She made her television debut in 1966 as a twin daughter in Nelson: A Study in Miniature with her twin sister, Karen Kessey, playing the other twin daughter. They also appeared in the Australian TV play All Fall Down.