FAP may refer to:
- Technology and industry
- FORTRAN Assembly Program, the macro assembler for some IBM mainframe computers
- Fair Access Policy, a term for a bandwidth cap, limiting Internet usage
- Femtocell (Femto Access Point), a small cellular telephone base station
- Fabrika automobila Priboj, a motor vehicle manufacturer based in Priboj, Serbia
- Diesel particulate filter (French, filtre à particules), a filter for motor exhaust gas
- Film Academy of the Philippines, the Philippines' official counterpart of the United States' Academy of Motion Picture Arts and Sciences
- Biology and medicine
- Functional analytic psychotherapy, clinical psychotherapy that uses a "radical behaviorist" position
- Familial adenomatous polyposis, a condition where polyps form in the large intestine
- Familial amyloid polyneuropathy, a neurodegenerative, genetically transmitted disease
- Fixed action pattern, an instinctive animal behavioral sequence
- FAP (gene), a human gene, encoding for the fibroblast activation protein
- Fas-associated phosphatase, a molecule that inhibits the effect of Fas ligand to make cells initiate apoptosis
- Politics, government, and armed forces
- Portuguese Air Force (Força Aérea Portuguesa)
- Peruvian Air Force (Fuerza Aérea del Peru)
- People's Armed Forces (Forces Armées Populaires), a Chadian insurgent group
- Federal-aid primary highway system, part of the United States Federal-aid highway program
- Federal Art Project, the visual arts arm of the US Great Depression-era Federal One program
- Free German Workers' Party (Freiheitliche Arbeiter Partei), a former German political party