René Oltmanns is a German voice actor known for his work in dubbing, primarily providing the German voices for characters in anime series and films. He was born on October 28, 1979, in Gifhorn, Germany.

Oltmanns has built a substantial career in voice acting, with his work appearing in numerous anime productions. He is frequently cast in supporting roles, though he has also taken on main character assignments. His voice can be heard in a wide variety of genres, demonstrating his range as a performer.

Among his most recognized roles are several prominent characters in major anime franchises. He voices the cunning and playful writer Shigure Souma in the German dub of the 2019 anime adaptation of Fruits Basket. He also lends his voice to Artemis, the wise-cat companion to the Sailor Guardians, in Pretty Guardian Sailor Moon Crystal: Season III and the subsequent films Pretty Guardian Sailor Moon Cosmos: The Movie. Another notable film role is Mr. Kusugi in the 2020 fantasy film A Whisker Away.

Beyond these key roles, Oltmanns's extensive filmography includes voicing Captain Byakuya Kuchiki in Bleach: Thousand-Year Blood War and its sequel part, as well as Spinel in the long-running Pokémon Horizons series. He has also contributed additional voices to other popular shows such as My Happy Marriage and The Grimm Variations. His work is consistently in German-language dubs, making these international hits accessible to a German-speaking audience. In 2020, he performed a main voice role in an unspecified television series.