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| Kazuo Ryuichi | |
| Aliases: | Mister Gus |
| Continuity: | True Blood |
| Notability: | Antagonist |
| Occupation: | Businessman |
| Gender: | Male |
| Race: | Human |
| Location: | Dallas, Texas |
| Associations: | Yakonomo Corporation Yakuza |
| Status: | Deceased |
| Died: | 2010 |
| First: | "Karma" |
| Final: | "Thank You" |
| Actor: | Will Yun Lee |
Kazuo Ryuichi, better known by his nickname, "Mister Gus", is a fictional businessman and a recurring minor character featured on the HBO television series True Blood. Played by actor Will Yun Lee, he first appeared in the season seven episode, "Karma". He made five appearances in the series in total.