Junnosuke Kawaguchi
 Junnosuke Kawaguchi (河口 純之助 Kawaguchi Junnosuke b. April 26 1961) is a Japanese musician best known as bassist of The Blue Hearts. He is a music producer in Tokyo and in 2009 became the deputy director of propaganda for the Happiness Realization Party. He was born Hiroyuki Kawaguchi (河口 宏之 Kawaguchi Hiroyuki) in the Setagaya ward of Tokyo.