Elizabeth Waterworth-Santo, also known as Lizzie Waterworth, is a British voice actress, best known for voicing the titular character of CITV's Horrid Henry, for which she was nominated for the British Academy Children's Awards Best Performer in 2019. She has also voiced other characters in animations, including Dougpo in Tinpo, Bello in Jelly Jamm, Uniqua and Austin in The Backyardigans, several characters from Alphablocks, Franklin in the UK dub of Franklin, Mungo in Strike, Marcus in Marcus Level, Seymour in Seymour Science and Cutie in It Takes Two.