Mariya Nishiuchi is a Japanese actress, model, singer, and voice actor born on December 24, 1993, in Fukuoka Prefecture. Her career in entertainment began in 2006 when she was discovered by a talent agency, and she gained early recognition by winning the grand prize in the Nicola magazine model contest in 2007.

Nishiuchi's involvement in voice acting began early in her career. In 2007, she participated in the initial voice actor recruitment for the Hollywood film The Golden Compass, being selected from over five thousand applicants to provide the Japanese-language voice for the protagonist Lyra Belacqua. This marked a notable voice role early in her career, though it was dubbing work for a live-action film rather than an original anime production.

Her work in anime voice acting includes a role in the long-running franchise One Piece. In 2012, she contributed to the animated feature One Piece Film: Z, providing voice work for a character named Marin. This represents one of her confirmed roles within the anime film genre.

Nishiuchi is also known for her performance in the 2016 live-action film Cutie Honey: Tears, where she portrayed Hitomi Kisaragi, the android who transforms into the titular hero Cutie Honey. It is important to clarify that this film is a live-action science fiction action movie, not an anime or animated production. While the character is rooted in a manga and anime franchise originally created by Go Nagai, the 2016 film features Nishiuchi acting on screen rather than providing a voice for an animated character.

Across her career, Nishiuchi has balanced work as a voice actor with significant success as a singer, actress, and model. She has also been a regular on Japanese variety television. A comprehensive list of recurring collaborations with specific animation studios or directors as a voice actor is not available.