| ABACUS | a Branch and Cut System 
| Others |
| ABACUS | Administration Billing And Contract Update System
| Others |
| ABACUS | Air Battle Analysis Center Utility System
| Others |
| ABACUS | Architecture Based Analysis Communication and Understanding of Systems
| Others |
| ABACUS | Association of British And Chinese University Students
| Others |
| ABACUS | Atari Bay Area Computer Users Society
| Others |
| ABACUS | Attribute Based Access Control User System
| Others |