| Naoki Miyanishi | |
| Team: | Hokkaido Nippon Ham Fighters |
| Number: | 25 |
| Position: | Pitcher |
| Birth Date: | 2 June 1985 |
| Birth Place: | Nishinomiya, Japan[1] |
| Bats: | Left |
| Throws: | Left |
| Debutleague: | NPB |
| Debutdate: | March 25 |
| Debutyear: | 2008 |
| Debutteam: | Hokkaido Nippon-Ham Fighters |
| Finalleague: | NPB |
| Statyear: | August 4, 2024 |
| Statleague: | NPB |
| Stat1label: | Win–loss record |
| Stat1value: | 37–40 |
| Stat2label: | Earned run average |
| Stat2value: | 2.48 |
| Stat3label: | Strikeouts |
| Stat3value: | 653 |
| Stat4label: | Holds |
| Stat4value: | 400 |
| Stat5label: | Saves |
| Stat5value: | 13 |
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| Awards: |
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is a Japanese professional baseball pitcher for the Hokkaido Nippon-Ham Fighters of Nippon Professional Baseball (NPB).
Miyanashi was selected to play in the .[2]
On August 4, 2024, Miyanishi became the first pitcher in Nippon Professional Baseball history to reach 400 holds.[3]