Adai may refer to:
- Adai people, Extinct Native American people from Louisiana and Texas
- Adai language, their language, now extinct
- A type of dosa, a South Indian crêpe
- A minor Kazakh Jüz "horde", numbering ca. 80–90,000
- Adai Khan, Mongol khan of Northern Yuan Dynasty
- Adai, FATA, a town in the Federally Administered Areas of Pakistan
- Adai Caddo Indians of Louisiana, state-recognized tribe
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