Lao may refer to:

• Something of, from, or related to Laos, a country in Southeast Asia
• Lao people (people from Laos, or of Lao descent)
• The Lao language
• Lao Rongzhi (born 1974), Chinese female serial killer
• Lao script, the writing system used to write the Lao language
  • Lao (Unicode block), a block of Lao characters in Unicode
• LAO, the international vehicle registration code for Laos

• Mount Lao (崂山), Qingdao, China
• Lao River, Italy, a river of southern Italy
• Lao River, Thailand, a tributary of the Kok River in Thailand
• Lao, Bhutan, a settlement in Trashiyangtse District, eastern Bhutan
• Lao, Estonia, village in Tõstamaa Parish, Pärnu County
• Lao, Togo
• LAO, IATA code of Laoag International Airport in the Philippines

• Laozi or Lao-Tzu, philosopher and poet of ancient China.

• Alternative spelling of Liu, common Chinese surname
• California Legislative Analyst's Office
• Lands Administration Office
• Legal Aid Ontario
• Legislative Affairs Office
• Linear alpha olefin
• The material lanthanum aluminate, or LaAlO₃

• Loa (disambiguation)