Constantin von Westphalen is a German voice actor and on-camera actor based in Hamburg, born in 1975. He works extensively in German-language dubbing for films and television series, as well as in documentary narration, commercial voiceovers, and audio plays. His vocal range is described as a bass-baritone, and he is a native German speaker who also works professionally in English and French.

Within the field of anime voice acting, von Westphalen has provided German dubbing voices for several notable series. He is known for voicing the character Agito Isurugi in the series Chaos Dragon. His other significant anime roles include providing the voice for Rai Uchiha and Shun in Naruto Shippuden. He also voiced the character Zenzou Hattori in Gintama. In the series Bungo Stray Dogs, he voiced Andre Gide, and in Alderamin on the Sky, he voiced Nirva Gin. His work in the anime industry often involves dubbing the performances of well-known Japanese voice actors such as Kouichi Yamadera, Shinichiro Miki, Keiji Fujiwara, and Ryuuichi Kijima.

Beyond strictly anime productions, von Westphalen's broader voice acting career includes roles in a wide range of international series and films. In live-action dubbing, he has provided German voices for characters in popular series such as playing Bruce in Stranger Things, Kaidu in Marco Polo, and a role in The Crown. He also voiced a character in the popular animated series Bob's Burgers. His work in animation extends to voicing characters in Thomas the Tank Engine & Friends and LEGO Ninjago: Masters of Spinjitzu.

In addition to his voice work for fictional media, von Westphalen is a prolific narrator for documentary programs, particularly for the German broadcasters ARD, ZDF, and arte. He has served as the main speaker for numerous nature and culture documentaries, including series on the Balkans and various German regions. His career also includes work as a director, a copywriter for commercials, and an on-camera actor in film and television productions.