Harry Melling is an English actor, best known for playing Dudley Dursley in the Harry Potter films. 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 and Mill Hill School. He was a member of the National Youth Theatre. He trained at the London Academy of Music and Dramatic Art.