Sebastian Dowling (born 13th December 2006 in Huddersfield, West Yorkshire) is an English actor who portrayed Viv and Bob Hope's son Heath Hope in Emmerdale from February 2007 to January 2024. His twin sister Gabrielle Dowling plays Heath's onscreen twin sister Cathy.
The Dowling twins were supposed to play Cathy and Heath from the characters' onscreen birth on 9th February 2007, however Sebastian had to stay in hospital for an additional week which meant Ella Whitehouse Downes and Lilith Kitching appeared as Cathy and Heath for the characters' first few appearances before the Dowling twins took over the roles from the episode broadcast on 14th February onward.