Rachel Walzer is an American-born voice actor and narrator who has been active in Japan since 1990. She earned a master's degree from the School for International Training in Vermont before relocating to Tokyo to begin her career. In addition to her voice work, she has served as a drama instructor at Aoyama Gakuin University since 1994.

Walzer is known for her bilingual abilities, providing voices for the Japanese versions of various international productions and English-language narration for Japanese media. Her voice acting credits include the role of Charlotte and Rosa in the television anime series Little Charo, as well as Ruby in its sequel, Little Charo 2. She also provided the voice for Koko in the 2009 computer-animated series Abunai Sisters. In the long-running series Case Closed, known as Detective Conan in Japan, she voiced the character Diana Kingston.

Beyond animation, Walzer's career encompasses a wide range of voice work in video games. Her notable game roles include Leona in The King of Fighters XII, Nora in Pokkén Tournament, and Savyna in Baten Kaitos: Eternal Wings and the Lost Ocean. She has also contributed to other game titles such as Rumble Roses and Michigan: Report from Hell.

Walzer's work as a narrator is extensive, particularly for the NHK television program Cool Japan, where she provided voice-over narration. Her professional voice is also featured in numerous public and commercial settings, including the in-car English announcements for the Tokyo Monorail, audio guidance for ATMs at the Bank of Tokyo-Mitsubishi UFJ, and in-flight entertainment channels for Japan Airlines.