Reo Tanie is a Japanese voice actor and singer. He made his debut as a voice actor in 2022 with the web anime project Rhapsody, where he portrayed the character Kokonoe Rakki. As part of this project, he also began his music career as a member of the fictional folk unit Blue Bird, making his major debut under the Dreamusic label. In March 2024, Tanie left his original agency, RO JAPAN AGENCY, and joined his current agency, ANDSTIR, in May of the same year.

Tanie's first major television anime role came in 2024, when he was cast as Mamekichi Maizuka in the series A Terrified Teacher at Ghoul School. In this capacity, he voices one of the students at a school for monsters. In 2025, he voiced the role of Kanade in the short anime series Latair the Earth, a biodiversity-themed story where his character is an Earth Saver who can transform into different creatures. Beyond animation, his voice acting work also includes roles in video games such as ROAD59: Shin Jidai Ninkyokutoku and in digital comics.