Tetsu Yamauchi (山内 テツ, Yamauchi Tetsu, born 21 October 1946) is a Japanese retired bass guitarist. In the 1970s, he was a member of several popular hard rock bands, including Free, where he replaced former bassist Andy Fraser before the band's final album Heartbreaker, and the Faces, where he replaced Ronnie Lane and appears on the band's final single, "You Can Make Me Dance, Sing or Anything", as well as touring with them and playing on the live album Coast to Coast: Overture and Beginners. He also recorded a number of solo albums and did extensive work as a session musician before retiring from the music industry in the late 1990s.