Theresa Buchheister is an American voice actor, director, and performer known for work in animation, audiobooks, and podcasts. They have provided English dub voices for characters in Japanese anime series and films.

Buchheister's voice acting credits in anime include the role of Yurika in the 2017 adult anime series Sexual Sacrifice. They also voiced the character Makabe in the 2017 anime Green Eyes: Ane Kyun! yori The Animation.

Beyond these specific roles, Buchheister has worked extensively as a voice director and engineer for the English adaptation of anime. They served as a voice director for the Pokémon anime series, working on much of seasons 18 and 19, as well as several XYZ specials and the film Hoopa and the Clash of Ages. Their role at DuArt Film & Video for the Pokémon English dub began in 2015. In addition to directing, Buchheister also performed as the voice of the Team Flare baddie Aliana in Pokémon XYZ.

Their broader voice work in animation extends to other children's series. Buchheister directed and engineered episodes for shows such as Winx Club, World of Winx, Robocar Poli, and Mily: Miss Questions, and also voiced characters in The Winx Club and Taffy.

In addition to on-screen animation, Buchheister has a substantial career directing and narrating audiobooks. They have directed hundreds of audiobooks, including works such as The Perks of Being a Wallflower and How Music Works, and have narrated books under their own name and potentially a pseudonym. Their voice performance work also includes roles in podcasts like the queer horror series You're the Last One.

Buchheister is also deeply involved in theater as a director, writer, and producer, and has worked as a lecturer and instructor for voice acting.