Eia or EIA may refer to:

Medicine

• Enzyme immunoassay

• Equine infectious anemia

• Exercise-induced anaphylaxis

• Exercise-induced asthma

• External iliac artery

Transport

• Edmonton International Airport, in Alberta, Canada

• Erbil International Airport, in Kurdistan Region, Iraq

• Evergreen International Airlines, an American airline

Other uses

• Early Iron Age, an archaeological period

• Economic Integration Agreement

• Eia, a former Medieval manor that is now part of Central London

Electronic Industries Alliance, formerly Electronic Industries Association, an American trade organization

• EIA standards

• Emerging issues analysis

• Emirates Investment Authority

• Energy Information Administration of the United States Department of Energy

• Environmental impact assessment

• Environmental Investigation Agency, a British environmental organisation

• Equity-indexed annuity

• European Inventor Award, awarded annually by the European Patent Office

• International Anticommunist Entente (French: )

People with the surname

• Harald Eia (born 1966), Norwegian comedian

• Magnhild Eia (born 1960), Norwegian politician