Kawaguchi Waku
- Title: Kawaguchi Waku
- Popularity: 0.709
- Known For: Acting
- Birthday: 2008-12-08
- Place of Birth: Kanagawa, Japan
- Homepage: https://www.sunmusic-gp.co.jp/talent/kawaguchi_waku/
- Also Known As: 川口 和空, かわぐち わく, Waku Kawaguchi, Kazuma Kawaguchi