Isabelle Cornish is an Australian actress. She is known for her television roles, particularly in Puberty Blues and Home and Away, and Crystal in the 2017 American television series Inhumans. She is the younger sister of actress Abbie Cornish. Her parents are Shelley and Barry Cornish. Isabelle has also modeled. She attended the Hunter School of the Performing Arts. Cornish is a vegetarian.