Shinjirō, Shinjiro or Shinjirou (written: 進次郎, 新次郎, 晋二郎 or 伸次郎) is a masculine Japanese given name. Notable people with the name include:
- Shinjiro Hiyama (桧山 進次郎?) (born 1969), Japanese baseball player
- Shinjiro Kazama (風間 伸次郎?) (born 1965), Japanese linguist
- Shinjirō Koizumi (小泉 進次郎?) (born 1981), Japanese politician
- Shinjiro Ono (小野 新次郎?), Japanese government official and diplomat
- Shinjiro Otani (大谷 晋二郎?) (born 1972), Japanese professional wrestler
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