JAF
| API
| JAF | |
| abbr. | Joni And Friends; Judge Advocate of the Fleet |
| abbr. avia. | Jaffna, Sri Lanka; jigs and fixtures |
| abbr. el. | job accounting facility |
| abbr. inet. | Just A Friendly |
| abbr. IT | Javabean Activation Framework; JavaBeans activation framework |
| abbr. mil. | joint armed forces |
| abbr. scottish | Joint Attack Fighter |
| API | |
| abbr. | Animal Protection Institute |
| abbr. dentist. | API according to Lange |
| abbr. ed. scient. | Academic Performance Index |
| abbr. med. | Association Des Pharmaciens De L'Industrie |
| abbr. mil. | Application Programming Interface |
| abbr. pharm. | active pharmaceutical ingredient |
| abbr. phys. | artificial periodic inhomogeneity |
| abbr. plast. | American Petroleum Institute |
| abbr. scient. | Air Pollution Index |
| abbr. UN AIDS. | AIDS Programme Index |
