| Acronym | Meaning |
| CAAB | Campaign for the Accountability of American Bases (UK) |
| CAAB | Civil Affairs Battalion |
| CAAB | Civil Aviation Authority of Bangladesh |
| CAAB | Command Assignment Advisory Board |
| CAAB | Communauté d'Agglomération de l'Aéroport du Bourget (French: Agglomeration Community of Le Bourget airport; Le Bourget, France) |