Genkai may refer to:
- Genkai, Saga, a town in Saga Prefecture, Japan
- Genkai Sea or Genkainada, a sea in Japan
- Genkai (YuYu Hakusho), a fictional character in the anime and manga series YuYu Hakusho
- Genkai, a Japanese dictionary written by Otsuki Fumihiko
- Genkai shūraku, a term for Japanese villages that are in danger of disappearing
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