Motohiro Ōta is a Japanese actor and voice actor born January 19, 1987, in Tokyo, Japan. He is affiliated with the agency Avance and began his entertainment career in 2005. While his professional activities include voice acting, Ōta is primarily known for his extensive work in Japanese theatre, particularly in stage adaptations of popular manga, anime, and video game franchises, a genre often referred to as 2.5-dimensional musicals. His height is 178 centimeters.

In the field of anime voice acting, Ōta is known for the supporting role of Chūkichi Nezu in the 2018 television anime series School Babysitters (also known as Gakuen Babysitters). Chūkichi Nezu is a schoolmate of the main character Ryūichi Kashima and an old friend of another student, Tomoya Yagi. He is characterized by his shaggy black hair and his dedicated, hardworking personality as he supports his large family.

His voice acting credits in anime appear to be limited, with School Babysitters representing his most prominent role in the medium to date. His broader career is far more extensively documented in live-action stage productions. Major theatre credits include performing as Shunsuke Imaizumi in stage plays of Yowamushi Pedal, as Shinji Ibu in The Prince of Tennis musicals, as Sengo Muramasa in Musical: Touken Ranbu, and as Mahito in a stage adaptation of Jujutsu Kaisen. He has also appeared in several Japanese films and television dramas. As such, while he is a credited voice actor, his primary renown and body of work lie within the Japanese theatre industry.