Rio Futaba (双葉 理央, Futaba Rio) is one of the main characters of the Seishun Buta Yarou wa Bunny Girl Senpai no Yume wo Minai series, who is a second-year student at Minegahara High School. She had been in the same class as Sakuta and Yuuma during their first year and is the sole member of the Science Club.

Rio's case of Adolescence Syndrome is explored in the third novel.