Shûhei Mainoumi
- Title: Shûhei Mainoumi
- Popularity: 0.001
- Known For: Acting
- Birthday: 1968-02-17
- Place of Birth: Ajigasawa-machi, Nishitsugaru District, Aomori Prefecture, Japan
- Homepage:
- Also Known As: 舞の海 秀平, 舞之海 秀平, まいのうみ しゅうへい, 長尾 秀平, Shûhei Mainoumi, マイちゃん, シュウヘイ