FPI
- Fabry–Pérot interferometer
- Family and Parenting Institute
- Faridpur Polytechnic Institute
- Fast probability integration
- Federal Prison Industries
- Fixed-point iteration
- Fluorescent penetrant inspection
- Football Power Index
- Force Protection Inc
- Foreign Policy Initiative
- Foreign Policy Institute
- Foreign portfolio investment
- Formal Public Identifier
- Free Press of India
- Freiburger Persönlichkeitsinventar
- Frunze Polytechnic Institute
- Islam Defenders Front
- Ivorian Popular Front
- Penal labor in the United States
- Service for Foreign Policy Instruments
- The Foreign Policy Institute