ACB
- ASEAN Centre for Biodiversity
- Absolute Championship Berkut
- Acton Bridge railway station
- Adjusted cost base
- Afghanistan Cricket Board
- African Central Bank
- Airport City Belgrade
- American Council of the Blind
- Amphibious Construction Battalion
- Amy Coney Barrett
- Anti-Corruption Bureau, Andhra Pradesh
- Antrim County Airport
- Aortocoronary bypass
- Asia Commercial Bank
- Asociación de Clubs de Baloncesto
- Association for Clinical Biochemistry and Laboratory Medicine
- Aurora Cannabis
- Australian Classification Board
- Australian Cricket Board
- Liga ACB
- Manta language