Susan Haydn Sheridan (18 March 1947 – 8 August 2015) was a British actress and voice artist. Her voice acting roles included Noddy in Noddy's Toyland Adventures, Princess Sylvia in Muzzy in Gondoland, Trillian in the BBC radio series The Hitchhiker's Guide to the Galaxy and Princess Eilonwy in the animated film The Black Cauldron.