Acca
- Acapulco (nightclub)
- Acca (plant)
- Acca Larentia
- Acca of Dunwich
- Acca of Hereford
- Acca of Hexham
- Accumulator bet
- Acetyl-CoA carboxylase
- Acre, Israel
- Adaptive chosen-ciphertext attack
- Advanced Composite Cargo Aircraft
- Aerospace Industries Association
- American Clinical and Climatological Association
- American College Counseling Association
- American Corporate Counsel Association
- Anglican Catholic Church in Australia
- Antiochian Catholic Church in America
- Armed Career Criminal Act
- Association of Chartered Certified Accountants
- Association of Christian College Athletics
- Attenborough Centre for the Creative Arts
- Australian Centre for Contemporary Art
- Camilla (mythology)
- HVAC
- United States Army Court of Criminal Appeals