Isobelle Molloy (born 6 October 2000) is an English child actress, best known for her portrayal of Amanda and later, Matilda Wormwood in the West End version of Matilda the Musical. She had her film debut as Young Maleficent in the 2014 Disney fantasy film, Maleficent.

Molloy was raised by her mother, Leanne Cornwell. She has one sibling, an older brother. Prior to 2012, she lived in Springfield (Chelmsford), Essex and attended Tomorrow’s Talent theatre school in Danbury. The primary school she attended was The Bishops’ C of E and R C Primary School.

Her family later moved to Maidenhead so she could attend Redroofs Theatre School after being awarded a full scholarship when the director of the school saw her performance as Matilda.