Bayannuur, Bayannur, or Bayinnur ( Mongolian: Баян-нуур, Mongolian: rich lake) may refer to:
Mongolia
- several Sums (districts) in different Aimags (provinces), Mongolia
- Bayan Lake, a lake in Zavkhan Province
China
- Bayannur, a prefecture-level city in Inner Mongolia
- Bayannur, Sonid [zh], a town in Sonid Left Banner, Inner Mongolia
- Bayannur, Horqin [zh], a sum (Township) in Horqin Right Middle Banner, Inner Mongolia
- Bayinnur, Otog [sv], (Chinese: 巴音淖尔乡) a Township in Otog Banner, Inner Mongolia
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