This is a list of Harry Potter cast members who portrayed or voiced characters appearing in the film series. The list below is sorted by film and the character's surname, as some characters have been portrayed by multiple actors.
Dozens of actors from the United Kingdom and Ireland portrayed or voiced characters appearing in the Harry Potter film series based on the book series by J. K. Rowling. In all the films, Daniel Radcliffe played Harry Potter, Rupert Grint played Ron Weasley and Emma Watson played Hermione Granger. When they were cast only Radcliffe had previously acted in a film. Complementing them on screen are such actors as Helena Bonham Carter, Jim Broadbent, John Cleese, Robbie Coltrane, Warwick Davis, Ralph Fiennes, Michael Gambon, Brendan Gleeson, Richard Griffiths, Richard Harris, John Hurt, Jason Isaacs, Miriam Margolyes, Helen McCrory, Gary Oldman, Alan Rickman, Fiona Shaw, Maggie Smith, Timothy Spall, Imelda Staunton, David Thewlis, Emma Thompson, and Julie Walters, among others. Thirteen actors appeared as the same character in all eight films of the series.

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