Harry Edward Melling (born 13 March 1989) is an English actor, best known for playing Dudley Dursley in the Harry Potter films.
Melling attended Hendon School and then Mill Hill School. He was a member of the National Youth Theatre. He trained at the London Academy of Music and Dramatic Art and starred in productions such as The Provoked Wife, King John, Antigone, Plenty and Sisterhood.
Melling appeared in five of the Harry Potter films as Harry Potter's bullying and spoiled cousin Dudley Dursley. In 2009, Melling made his stage debut in a revival of Mother Courage and her Children at the Royal National Theatre. He appeared in an episode of the BBC series Merlin entitled "The Sorcerer's Shadow", playing a young warlock named Gilli who intends to use magic to help him win Camelot's legendary tournament. Melling also played Robert Brown in the BBC series Just William.
Melling is the grandson of Patrick Troughton, best known as the Second Doctor in the science fiction series Doctor Who. He is the nephew of David Troughton and Michael Troughton, and the first cousin of Jim Troughton and Sam Troughton.