Harry Edward Melling (born 13 March 1989) is an English actor, best known for playing Dudley Dursley in the Harry Potter films. He played a young thespian with no arms or legs in the Coen brothers' 2018 film The Ballad of Buster Scruggs.
Melling was born in London. His maternal grandfather was actor Patrick Troughton, best known for his role as the Second Doctor in Doctor Who. He is also the nephew of actors David Troughton and Michael Troughton, and the first cousin of cricketer Jim Troughton and actor Sam Troughton. Melling attended St Paul's Primary School, Hendon School and Mill Hill School. He was a member of the National Youth Theatre. He trained at the London Academy of Music and Dramatic Art.
In his early career, Melling starred in stage productions of The Provoked Wife, King John, Antigone, and Plenty. He appeared in five of the Harry Potter films as Harry Potter's spoiled cousin Dudley Dursley. In 2009, he starred 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. He also played Robert Brown in the BBC series Just William.