Hiro D. Yamamoto (born April 13, 1961) is an American bassist who was a founding member of grunge band Soundgarden, along with Kim Thayil and Chris Cornell, in 1984. He left the band in 1989; two years later, Yamamoto started the independent rock band Truly together with Screaming Trees drummer Mark Pickerel and Robert Roth from The Storybook Krooks. In 2016, Yamamoto co-founded the surf trio Stereo Donkey.
