Gretchen Zilm is a German voice actor known for her work in anime dubbing. She is most recognized for providing the German voice of the young protagonist Rin Kaga in the series Bunny Drop, which is also known as Usagi Drop. She voiced the character in both the main television series and its accompanying mini-episodes. In addition to the television series, Zilm also voiced Rin Kaga in the 2011 live-action film adaptation of Usagi Drop, dubbing the actress Mana Ashida.

Zilm's other known anime voice role includes a small part in the horror film Ring, where she dubbed the role of a middle school student originally played by Asami Nagata for the second German synchronization of the 1998 film.

Based on available records, Zilm has a limited number of credited voice roles. Her work appears to involve a collaboration with another voice actor named Karl Zilm, who voiced a different character in the Usagi Drop film. No information is available regarding her broader career background, any other major voice roles beyond those listed, recurring professional collaborations, or notable achievements such as awards or nominations.