Harry Hadden-Paton is a British actor. He started acting in the mid-2000s, debuting as Doug Davis in the French film La Vie en rose. He next appeared with a small role in the British film In the Loop. His career became more prolific in the 2010s, performing in the movie The Deep Blue Sea, followed by a role on the TV movie Richard II. His subsequent roles were in the films Having You and About Time. From 2014 to 2015, he played Bertie Pelham on Downton Abbey. He next portrayed Martin Charteris on the Netflix series The Crown from 2016 to 2017.