Yanai (written: 柳井, 柳内 or 箭内) is a Japanese surname. Notable people with the surname include:
- Hiroshi Yanai (disambiguation), multiple people
- Masayuki Yanai (箭内 政之, born 1959), Japanese astronomer
- Micky Yanai (ミッキー 柳井, born 1959), Japanese pornographic actor
- Shinsaku Yanai (柳内 伸作, born 1947), Japanese writer
- Tadashi Yanai (柳井 正, born 1949), Japanese billionaire
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