| Masato Watanabe | |
| Position: | Infielder |
| Birth Date: | 3 April 1979 |
| Birth Place: | Jōtō-ku, Osaka, Japan |
| Bats: | Right |
| Throws: | Right |
| Debutleague: | NPB |
| Debutyear: | 2001 |
| Debutteam: | Chiba Lotte Marines |
| Finalleague: | NPB |
| Finaldate: | April 13 |
| Finalyear: | 2012 |
| Finalteam: | Chiba Lotte Marines |
| Statleague: | NPB |
| Stat1label: | Batting average |
| Stat1value: | .207 |
| Stat2label: | Home runs |
| Stat2value: | 11 |
| Stat3label: | RBI |
| Stat3value: | 71 |
| Teams: |
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Masato Watanabe (渡辺 正人, born April 3, 1979, in Osaka) is a Japanese former professional baseball infielder. He played in Nippon Professional Baseball (NPB) for the Chiba Lotte Marines from 2001 to 2012.