William Melling is a British actor who portrays Nigel Wolpert in the film adaptations of Harry Potter and the Goblet of Fire, Harry Potter and the Order of the Phoenix, Harry Potter and the Half-Blood Prince, Harry Potter and the Deathly Hallows: Part 1, and Harry Potter and the Deathly Hallows: Part 2.

William began his career playing the role of Boy Next Door in the BAFTA winning drama UK series William and Mary. In 2004, he played the Young Rawdy Crawley in UK TV series Vanity Fair. He then began playing the role of Nigel Wolpert, Hogwarts student and avid Harry Potter fan, in the Harry Potter films.