| Haruhiro Hamaguchi | |
| Position: | Pitcher |
| Team: | Yokohama DeNA BayStars |
| Number: | 26 |
| Bats: | Left |
| Throws: | Left |
| Birth Date: | 16 March 1995 |
| Birth Place: | Miyaki District, Saga, Japan |
| Debutdate: | April 2 |
| Debutyear: | 2017 |
| Debutteam: | Yokohama DeNA BayStars |
| Debutleague: | NPB |
| Statyear: | 2023 |
| Stat1label: | Win–loss record |
| Stat1value: | 42–42 |
| Stat2label: | Earned Run Average |
| Stat2value: | 3.80 |
| Stat3label: | Strikeouts |
| Stat3value: | 613 |
| Teams: |
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is a professional Japanese baseball player. He plays pitcher for the Yokohama DeNA BayStars.
In Game 4 of the 2017 Japan Series, with DeNA facing elimination, Hamaguchi did not allow a hit for innings.[1]
On October 10, 2018, he was selected Japan national baseball team at the 2018 MLB Japan All-Star Series.[2]