FBA may refer to:
- Fellow of the British Academy
- Federation of British Artists
- Federal Bar Association
- First Baptist Church, Atlanta, Georgia
- Flux Balance Analysis, in chemical engineering/systems biology
- Freshwater Biological Association
- Fixed Block Architecture, in computer science
- Fulfillment by Amazon, Amazon.com's third-party fulfillment service
- Form-based authentication
It may also refer to a family of seaplanes and their manufacturer:
- Franco-British Aviation, aircraft manufacturers, makers of:
- FBA Type A
- FBA Type H
- FBA 17
- FBA 19
- FBA 21
- FBA 290
- FBA 310
- Found Brothers Aviation, aircraft manufacturers, makers of:
- Found FBA-1
- Found FBA-2