Koshi Inaba (稲葉浩志 Inaba Kōshi?), born Hiroshi Inaba (稲葉浩志 Inaba Hiroshi?) on September 23, 1964 in Tsuyama, Okayama, is a Japanese vocalist, multi-instrumentalist and songwriter. He is best known as the singer and lyricist of the rock duo B'z.
On January 18th, 2017, Inaba released a collaborative album with Stevie Salas under the name 'Inaba/Salas.' The album, 'Chubby Groove,' went to #2 in the Japanese Music Charts.