| Actions par Minute | Actions per minute |
| Actions stupides | Foolish pranks |
| ActionScript | ActionScript |
| Actium | Actium |
| activateur | activator |
| activation | activation |
| Activation neutronique | Neutron activation analysis |
| active | spry |
| Active Denial System | Active Denial System |
| Active Directory | Active directory |
| Active record | Active record pattern |
| Active Server Pages | Active Server Pages |
| Active Time Battle | Final Fantasy battle systems |
| activement | busily |
| activer | activate |
| Activer les choses | Speed things up |
| ActiveX Data Objects | ActiveX Data Objects |
| Actividades de construcción y servicios | Grupo ACS |
| activisme | activism |
| Activisme pédophile | Pro-pedophile activism |
| activiste | activist |
