Osamu Ishiwata (石渡治 Ishiwata Osamu?, born May 16, 1959 in Kanagawa, Japan) is a Japanese manga artist. He won the 1989 Shogakukan Manga Award for shōnen for B.B. The mangaka Yoshitomo Yoshimoto is his younger brother.
- Osamu Ishiwata Masterpiece Collection (石渡治傑作集?)
- Juugatsu no Mangetsu ni Ichiban Chikai Doyoubi (10月の満月に一番近い土曜日?)
- Super Rider (スーパーライダー?)
- Takeru (タケル?)
- Passport Blue (パスポート・ブルー?)
- Happy Man
- Hi no Tama Boy (火の玉ボーイ?)
- Ragtime Brass (ラグタイムブルース?)
- 2 (ツヴァイ?)
- Hakuhei Musha (白兵武者?)
- Odds (manga) (オッズ?)
- "小学館漫画賞：歴代受賞者" (in Japanese). Shogakukan. Retrieved 2007-08-19.
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