ASF
- APL (programming language)
- ASF Mexico
- Acid Survivors Foundation
- Advanced Synchronization Facility
- Advanced Systems Format
- African Standby Force
- African swine fever virus
- Air superiority fighter
- Airports Security Force
- Alabama Shakespeare Festival
- Alaska Satellite Facility
- Alert Standard Format
- Altered Schaedler flora
- American Steel Foundries
- Animal source foods
- Antispam
- Apache Software Foundation
- Army Service Forces
- Ashfield railway station, Glasgow
- Asian Sailing Federation
- Asimov's Science Fiction
- Atmel
- Australian Softball Federation
- Australian Speleological Federation
- Autism Science Foundation
- Avocats Sans Frontières
- Narimanovo Airport
- Serine/arginine-rich splicing factor 1
- Superior Auditor of the Federation
- Swiss Football Association
- The American-Scandinavian Foundation