Tanja Schmitz is a German actress and voice actress, recognized for her extensive work in dubbing for anime series and films. Born on April 13, 1973, she is also active as a dubbing director and dialogue script writer, contributing to the German-language adaptations of numerous Japanese animations.

Her voice can be heard in a wide array of notable anime roles. She is known for providing the German voice of Fenneko in the popular Netflix series Aggretsuko, a role she has reprised across multiple seasons and specials, including Aggretsuko: We Wish You a Metal Christmas. Schmitz also voiced the character Miho Amakata across the Free! franchise, appearing in Free! - Iwatobi Swim Club, Free! Eternal Summer, Free! -Dive to the Future-, and the film Free! -Take Your Marks-. In the action-adventure series Coyote Ragtime Show, she lent her voice to two characters, August and Franca. Her other prominent roles include Mumei in Kabaneri of the Iron Fortress: The Battle of Unato, Rie Matoba in Sword Gai: The Animation Part II, Sonken Chuubou in Ikki Tousen: Xtreme Xecutor, and multiple portrayals of the character Lin in the Shin Kyūseishu Densetsu Hokuto no Ken series of films.

Beyond these performance roles, Schmitz has made significant contributions behind the scenes in German anime localization. She has served as a dubbing or ADR (Automated Dialogue Replacement) director and script writer for several series. Her directorial credits include work on Ikki Tousen: Great Guardians, Sekirei and its sequel Sekirei: Pure Engagement, both seasons of Vampire Knight, and Yu-Gi-Oh! Zexal. This dual role as both a voice performer and a director highlights her comprehensive expertise in the field of voice acting and dubbing production.