| Naoya Masuda | |
| Position: | Pitcher |
| Team: | Chiba Lotte Marines |
| Number: | 52 |
| Birth Date: | 25 October 1989 |
| Birth Place: | Tokyo Japan |
| Bats: | Right |
| Throws: | Right |
| Debutleague: | NPB |
| Debutdate: | March 30 |
| Debutyear: | 2012 |
| Debutteam: | Chiba Lotte Marines |
| Statyear: | 2023 season |
| Statleague: | NPB |
| Stat1label: | Win–loss record |
| Stat1value: | 32-48 |
| Stat2label: | ERA |
| Stat2value: | 2.94 |
| Stat3label: | Strikeouts |
| Stat3value: | 626 |
| Stat4label: | Saves |
| Stat4value: | 218 |
| Stat5label: | Holds |
| Stat5value: | 166 |
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Naoya Masuda (益田 直也, born October 25, 1989, in Kinokawa, Wakayama) is a Japanese professional baseball pitcher for the Chiba Lotte Marines of Japan's Nippon Professional Baseball.
In the 2021 season, Masuda set a Marines club record for saves, with 38,[1] while posting a 2.24 ERA with 68 strikeouts and earning NPB All-Star honors on the year.