Gaku Shindo (進藤 学, Shindō Gaku, born Hironobu Ninagawa (蜷川 博信, Ninagawa Hironobu) on January 7, 1980, in Tokyo, Japan) is a Japanese actor and singer.
His debut role was as the Eagle Sazer in the tokusatsu series Chousei Kantai Sazer-X, but he is most well known for playing Harukaze Kurobane in the Prince of Tennis musicals in 2006.
Before he debuted in showbiz, he was a tango dancer and instructor.
He also appeared in other tango events as a professional dancer.