Bayannuur, Bayannur, or Bayinnur ( , Mongolian: rich lake) may refer to:
Mongolia several Sums (districts) in different Aimags (provinces), Mongolia Bayannuur, Bayan-Ölgii Bayannuur, Bulgan Bayan Lake, a lake in Zavkhan Province
China Bayannur, a prefecture-level city in Inner Mongolia , a town in Sonid Left Banner, Inner Mongolia , a sum (Township) in Horqin Right Middle Banner, Inner Mongolia , () a Township in Otog Banner, Inner Mongolia