| Naoto Nishiguchi | |
| Position: | Pitcher |
| Team: | Tohoku Rakuten Golden Eagles |
| Number: | 062 |
| Birth Date: | 14 November 1996 |
| Bats: | Right |
| Throws: | Right |
| Debutleague: | NPB |
| Debutyear: | 2018 |
| Debutteam: | Tohoku Rakuten Golden Eagles |
| Statyear: | March 31, 2022 |
| Statleague: | NPB |
| Stat1label: | Win–loss record |
| Stat1value: | 6-2 |
| Stat2label: | ERA |
| Stat2value: | 3.06 |
| Stat3label: | Strikeouts |
| Stat3value: | 58 |
| Teams: |
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Naoto Nishiguchi (西口 直人, born November 14, 1996, in Yao, Osaka) is a Japanese professional baseball pitcher for the Tohoku Rakuten Golden Eagles in Japan's Nippon Professional Baseball (NBP). He made his NPB debut in 2018, pitching in one game that season.