The character Lord Voldemort in the Harry Potter film series is primarily played by Ralph Fiennes, who portrayed him from "Harry Potter and the Goblet of Fire" (2005) through to "Harry Potter and the Deathly Hallows – Part 2" (2011)

. Before Ralph Fiennes took over the role, Voldemort was first portrayed by Richard Bremmer in "Harry Potter and the Sorcerer's Stone" (2001) during a flashback scene

. Additionally, Ralph Fiennes' nephew, Hero Fiennes Tiffin, played the young Tom Riddle (Voldemort's younger self) in "Harry Potter and the Half-Blood Prince" (2009)

. In summary:

• Richard Bremmer played Voldemort in the first film (Sorcerer's Stone) briefly.
• Ralph Fiennes is the main actor who played Voldemort in the majority of the series from the fourth film onward.
• Hero Fiennes Tiffin portrayed young Tom Riddle in the sixth film.