Simon Zwiers is a Dutch actor, voice actor, contrabassist, and singer, born in The Hague on March 20, 1974. He is an autodidact in both acting and music, having never attended a formal academy for either discipline. His professional career began in the mid-1990s, and he has since built a substantial body of work across theatre, film, and television, with a particularly extensive portfolio in voice acting for animated series, films, and video games.

While Zwiers is active in live-action roles in Dutch television and film, he is perhaps best known for his prolific work in dubbing and voice-over. In the realm of anime, he is notable for providing the Dutch voice for the cyborg warrior Briareos Hecatonchires in the 2007 CGI film Appleseed: Ex Machina. This role places him within the international cast of a major anime production, dubbing a character originally voiced by Kōichi Yamadera in Japanese and David Matranga in English.

Beyond this specific credit, Zwiers's voice acting career is marked by a high volume of work in dubbing major international animated productions into Dutch. He frequently provides voices for characters in films and series from major studios, including Pixar, Disney, DreamWorks, and Marvel. Some of his prominent roles include Commissioner Bogo in Zootropolis and its sequel Zootropolis 2, Rick Mitchell in The Mitchells vs. The Machines, Ugo in Luca, and Portier in Elemental. He is also the Dutch voice of Stromboli in the 2022 live-action and animated Pinocchio films, and has voiced Darth Vader and Emperor Palpatine / Darth Sidious in various Star Wars animated series such as Star Wars Rebels, Star Wars: The Bad Batch, and Lego Star Wars specials. In video games, he is known for voicing Captain Qwark in the Ratchet & Clank game series and Eruptor in the Skylanders franchise.

Zwiers's career is characterized by recurring collaborations with major entertainment franchises rather than specific directors or studios. His work spans a wide range of genres and formats, from major animated feature films to long-running television series. He has voiced characters in properties for Marvel (e.g., The Underminer in Incredibles 2, Wolverine in various series), and has been the voice of Happy Hogan, Phil Coulson, and The Collector in the animated series What If...?. His consistent work for Dutch dubs of international blockbusters and series represents a significant achievement in the field of voice acting in the Netherlands.