| Seiichi Oba | |
| Birth Date: | 13 April 1973 |
| Birth Place: | Kotooka, Akita |
| Nationality: | Japanese |
| League: | B.League |
| Team: | Akita Northern Happinets |
| Position: | General manager |
| Height Ft: | 5 |
| Height In: | 9 |
| Highschool: | Noshiro Technical (Noshiro, Akita) |
| College: | Akita Keizaihoka University |
| Years1: | 1996–1998 |
| Team1: | Zexel Blue Winds |
| Highlights: | As player:
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is a Japanese professional basketball executive and former player, currently serving as the general manager of the Akita Northern Happinets of the Japanese B.League.[1]