Ryo Yamada (山やま田だ リョウ Yamada Ryō) is one of the main characters in the manga and anime series, Bocchi the Rock!. She is in her second year at Shimokitazawa High School and is the bassist of the band, Kessoku Band. She works a part-time job at the live house STARRY.

She has an androgynous appearance and a mysterious atmosphere, such as silence and expressionlessness. She often fascinates women, including Kita Ikuyo, who falls in love at first sight.

Ryo often sounds bored and monotonous. Her voice is medium-low. Ryo does sing backing vocals on the singing tracks, so singing is a plus, but not required.