NIU or Niu can refer to:
Universities Northern Illinois University (DeKalb, Illinois, United States) Northland International University (Dunbar, Wisconsin, United States) National Intelligence University (Bethesda, Maryland, United States) National Ilan University (Yilan City, Yilan County, Taiwan)
Chinese topics Niu () means cattle (ox, bull, cow, etc.) in Chinese. Niu (surname), Chinese surname Ox (zodiac) Ox (Chinese constellation) Radical 93 or radical cow Niu Technologies, an electric scooter company headquartered in Changzhou, China
Other topics Niue (ISO country code) Network Interface Unit (telecommunications); see Network Interface Device (NID) Niu Sale (born 1959), American football player David Niu, Australian-American rugby league footballer and coach Coconut, niu is the Hawaiian word