Hiro D. Yamamoto[1] (born April 13, 1961) is a Japanese-American bassist who was a founding member of grunge band Soundgarden, along with Kim Thayil and Chris Cornell in 1984.

After Yamamoto departed, he completed the requirements for his master's degree in physical chemistry at Western Washington University.

[citation needed] Following a successful 2016 jam session, Yamamoto formed a surf-inspired trio, Stereo Donkey, with drummer Mike Bajuk, and guitarist Pat Wickline.

The recording reportedly works as both surf music and exotica, yet is still rooted in, "Pacific Northwest rock history".

[4] On November 8, 2021, Yamamoto performed with other noted musicians at an event in Seattle honoring the Asian Hall of Fame's 2021 inductees, and the 35th anniversary of the Robert Chinn Foundation.