In 2009, Melling starred in a revival of Mother Courage and Her Children at the Royal National Theatre. He appeared in "The Sorcerer's Shadow", an episode of the BBC television series Merlin, playing a young warlock who intends to use magic to help him win Camelot's legendary tournament. He also played Robert Brown in the BBC television series Just William.[7] In 2009, it was announced that Melling had lost so much weight since his last appearance in Harry Potter that he was now "unrecognisable". The role of Dudley was almost recast for Harry Potter and the Deathly Hallows – Part 1, but Melling was able to reprise the part by wearing a fat suit. He said of the change, "I can now shed the child actor thing, like the fat, and start a new career, because no one sees me as Dudley."[8]
In 2014, Melling made his playwriting debut at HighTide Festival with his one-man show Peddling.[9]
[I] came away haunted by a scattering of sights and sounds—above all, by the recitations of the limbless man, which thrum with genuine yearning. He is beautifully played, with a little help from C.G.I., by Harry Melling, who was once the odious Dudley Dursley in the Harry Potter films. Funny how people grow up.[11]
In 2020, Melling played evangelical preacher Roy Laferty in the Netflix thriller The Devil All The Time. That same year, he appeared in the Netflix series drama The Queen's Gambit as Harry Beltik, a chess player, friend, and competitor of Beth's in Kentucky.[6]
Melling appeared in a Coen brothers film a second time as Malcolm in The Tragedy of Macbeth (2021).[6]
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