FIA is a three-letter acronym (TLA) which 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
• 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
• Flow injection analysis, a technique used in analytical chemistry
• Forest Inventory and Analysis program of the United States Forest Service
• 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

Fia as a name may refer to:

• a heroine from the video game Riviera: The Promised Land
• a variant of the Ludo board game
• Fia Tootoo, a Samoan Australian rules football player

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