William Ash, (born 13 January 1977) is a British TV and film actor. His appearances include Mad About Mambo, Lilies, Burn It, All the King's Men, A Midsummer Night's Dream, Doctor Who and more recently Hush and Waterloo Road.

He began his career in the ITV series Where the Heart Is. His stage credits include the premiere production of How to Disappear Completely and Never Be Found with Sheffield Theatres. In 2009, Ash played the leading role of "Zakes Abbott" in the British horror film HUSH.