- AC stands for Aachen (Germany)
- AC stands for Abdominal Circumference (obstetrics)
- AC stands for Aberdeen College
- AC stands for Aberración Cromosómica (Spanish)
- AC stands for Absolute Ceiling
- AC stands for Absorption Chiller
- AC stands for Abstinence Committed
- AC stands for Academia Cotopaxi (Quito, Ecuador)
- AC stands for Academic Complex
- AC stands for Academic Institution (DNS zone for UK academic institutions; as in .ac.uk)
- AC stands for Acceleration (Front Page Sports Football ’95 et al)
- AC stands for Accept (ITU-T)
- AC stands for Acceptance Criteria
- AC stands for Access Card
- AC stands for Access Category
- AC stands for Access Channel
- AC stands for Access Concentrators
- AC stands for Access Control
- AC stands for Access Customer
- AC stands for Acción Ciudadana (Spanish: citizen action; Guatemala)
- AC stands for Account Code (Sprint BCS-29)
- AC stands for Account Control
- AC stands for Account Current
- AC stands for Accountability Measurement
- AC stands for Accountancy
- AC stands for Accounting Clerk
- AC stands for Ace Combat (video games 1-5)