Kumagai (written: 熊谷 lit. "bear valley"), also transliterated as Kumagae, is a Japanese surname. Notable people with the surname include:

Fictional characters:

See also

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  • Kumagai-shuku (熊谷宿, Kumagai-shuku), eighth of the sixty-nine stations of the Nakasendō
  • Kumagai Gumi, Japanese construction company