Liao can mean:
- Liao Dynasty, a former dynasty in northern China founded by the Khitan people
- Liaoning Province, Chinese abbreviation
- Liao (surname) (廖), a Chinese family name
- Liao River, river in northeast China
- House Liao of the Capellan Confederation in the fictional BattleTech universe
- liao, a grammatical particle in Singlish
- King Liao of Wu, king of Wu state in Spring and Autumn Period
