FIA may refer to:

• Farnborough International Airshow
• Federal Investigation Agency, of Pakistan
• Fédération Internationale de l'Automobile, the world governing body for all forms of motor sport using four or more wheels
• Federated Ironworkers' Association of Australia, a former Australian trade union
• Feline Infectious Anemia
• Fellow of the Institute of Actuaries, the highest qualification obtainable from the Institute of Actuaries in the United Kingdom
• FIA Card Services, the new name of MBNA Corporation
• Fiscal Information Agency, an agency in Taiwan
• Flow injection analysis, a technique used in analytical chemistry
• Freedom of Information Act (United States), a piece of legislation that governs rules about freedom of information in the United States, often abbreviated as FOIA
• Friends in Action International, an evangelical missions agency based in Mansfield, Missouri
• Future Imagery Architecture, satellite program of the United States National Reconnaissance Office
• Futures Industry Association, an association in the United States which represents organizations that have an interest in the futures market
• Freund's incomplete adjuvant, one type of Freund's adjuvant, an immune system booster used in some vaccines
• International federation of actors

The Fédération Internationale de l'Automobile (FIA, English: International Automobile Federation) is an association established as the Association Internationale des Automobile Clubs Reconnus (AIACR, English: 'International Association of Recognized Automobile Clubs') on 20 June 1904 to represent the interests of motoring organisations and motor car users. To the general public, the FIA is mostly known as the governing body for many auto racing events.