| AF | Air Force | - | Atmospheric Research Center |
| AF | Alternating Field Demagnetization | - | Computer Acronyms(common) |
| AF | Anaerobic Filter | - | Computer Acronyms(common) |
| AF | Atomic Fluorescence | - | Computer Acronyms(common) |
| AF | Audio Frequency | - | Computer Acronyms(common) |
| AF | Atrial Fibrillation | - | Medical(slang) |
| AF | Afghanistan (FIPS 10-4 Country Code; ISO 3166 Digram) -Air Force | - | Astronomy |
| AF | Afrikaans Language (ISO 639-1 Code) | - | Astronomy |
| AF | Attofarad | - | Astronomy |
| AF | United States Air Force Affiliate | - | Business and Finance |
| AF | Auxiliary Feed | - | Business and Finance |
| AF | Audio Frequency | - | Business and Finance |
