Luo or LUO may refer to:

• Luo peoples, an ethno-linguistic group of eastern and central Africa
  • Luo people of Kenya and Tanzania or Joluo, an ethnic group in western Kenya, eastern Uganda, and northern Tanzania.
    • Luoland, the tribal homeland of the group immediately above
• Luo languages, a dozen languages spoken by the Luo peoples
  • Luo language (Kenya and Tanzania) or Dholuo
  • Southern Luo, a dialect cluster of Uganda and neighboring countries
• Luo language (Cameroon), a nearly extinct language of Cameroon - not associated with Luo languages above

• Luo (surname) (羅), Chinese surname
• Luò (surname) (駱), Chinese surname
• Jing Jing Luo, Chinese composer
• Luo Changqing, killed in the 2019 Hong Kong protests
• Michael Luo (born 1976), American journalist
• Show Lo (born 1979), Taiwanese singer, dancer and actor

• Luo (state), a Chinese feudal state, 11th–7th centuries B.C.
• Luo River (Henan) (洛河, Luohe), a tributary of the Yellow River, flows mostly in Henan province of China
• Luo River (Shaanxi) (洛河, Luohe), river in Shaanxi, China, second largest tributary of the Wei River
• Luo River (Fujian) (洛江, Luojiang), river in Fujian, China; flows into Quanzhou Bay of Taiwan Strait
• Luo Scientific Reserve, a protected area in the Democratic Republic of the Congo
• Luo (also Luoyi 洛邑) the ancient Zhou capital: see Luoyang

• Luo (instrument), a type of Chinese gong
• Luo, a character in the novel Balzac and the Little Chinese Seamstress by Dai Sijie

• LUO, the IATA abbreviation for Luena Airport in Angola
• Luo River (disambiguation)