Maxi Geithner is a German actress and voice actress born in Berlin in 1986. Her career spans work on screen, on stage, and in voice-over for film and television. She studied acting in Berlin and also holds a degree in media and film science.

In addition to her on-screen roles in German television productions such as SOKO Wismar and Helen Dorn, Geithner has built an extensive portfolio as a voice actress. She has provided the German voice for characters in numerous international series and films. According to the Deutsche Synchronkartei, she has over 60 voice roles to her credit. These include voicing actresses such as Melia Kreiling in Emily in Paris, Yaya DaCosta in The Lincoln Lawyer, and Aliyah O'Brien in Matchmaker Mysteries. Her work also extends to animation and anime, with roles in series like Rilakkuma and Kaoru on Netflix.

Geithner is noted for lending her voice to a wide array of characters, from mysterious and determined women to mothers and animated figures, often bringing a warm and authentic tone to her performances. One of her notable roles in anime is the character Akira Shinonome in the German dubbed version of the series Chidori RSC, also known as Rifle is Beautiful. In this series about a high school rifle shooting club, she voices the character originally performed by Japanese voice actress Natsumi Fujiwara.