LIA may refer to:
- People
- Lia (name), a list of people with this name
- Places
- Lia, Iran, a village in Qazvin Province, Iran
- Lia, Malta, a town in Malta
- Lia, Norway, a village in Sør-Fron municipality, Norway
- Logan International Airport
- Luang Prabang International Airport
- Organisations
- Laser Institute of America, international society for laser applications and safety
- Libyan Investment Authority
- Logistics Innovation Agency of the United States Army
- London Irish Amateur, an English Rugby Union team
- Long Island Association, a business lobby or coalition founded in the 1920s
- Love In Action, a Christian ex-gay organization
- Other
- Lia (food), a rice-based dish in Orissa, India
- Language Independent Arithmetic
- Little Ice Age, a period of cooling between the 14th and 19th centuries