| Masaji Hiramatsu | |
| Position: | Pitcher |
| Bats: | Right |
| Throws: | Right |
| Birth Date: | 19 September 1947 |
| Birth Place: | Takahashi, Okayama, Japan |
| Debutyear: | 1967 |
| Debutteam: | Taiyo Whales |
| Finalyear: | 1984 |
| Finalteam: | Yokohama Taiyo Whales |
| Stat1label: | Win–loss record |
| Stat1value: | 201–196 |
| Stat2label: | Earned run average |
| Stat2value: | 3.31 |
| Stat3label: | Strikeouts |
| Stat3value: | 2,045 |
| Teams: | |
| Awards: |
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| Hoflink: | Japanese Baseball Hall of Fame |
| Hoftype: | Japanese |
| Hofdate: | 2017 |
is a Japanese former professional baseball pitcher in Nippon Professional Baseball (NPB). He played for the Taiyo Whales / Yokohama Taiyo Whales from 1967 to 1984.[1] He won the Eiji Sawamura Award in 1970.