FEP may refer to
- Free England Party, A political party seeking independence for England from the United Kingdom
- Albertus Airport, Freeport, Illinois (IATA code)
- Federação Escotista de Portugal
- Features, events, and processes, terms often referred to in the field of radioactive waste management to define relevant scenarios for safety assessment studies
- Federation of European Professional Photographers, a body of professional photographers associations in Europe - based in Brussels
- Federation of European Publishers, the representative body for publishers in Europe, based in Brussels
- Final Evaluation Problem, a U.S. Navy graded 48-hour evolution to evaluate how well its units learned during its Tailored Ship's Training Availability (TSTA) certification exercises
- Fluorinated ethylene propylene, a member of the fluorocarbon family of plastics with good electrical insulating properties and chemical and heat resistance
- Firewall Enhancement Protocol (RFC 3093)
- Fort Edmonton Park, a living history museum in Edmonton, Canada
- Free energy perturbation, a method in computational chemistry and statistical mechanics
- Free erythrocyte porphyrins: a screening method for lead poisoning in the blood
- Front endpaper of a book
- Front end processor, a communications device which interfaces a number of peripheral devices to the host computer.