| Acronym | Definition |
|---|
| APAB | All Primary All Backup |
| APAB | As-Planned As-Built (project management) |
| APAB | Associazione Per l'Agricoltura Biodinamica (Italian: Biodynamic Agriculture Association; est. 1947) |
| APAB | Atlanta Planning Advisory Board |
| APAB | Agricultural Preservation Advisory Board (Maryland county governments) |
| APAB | Asia-Pacific Advisory Board (International Association of Outsourcing Professionals) |
| APAB | Assessment and Planning Appeal Board (Fredericton, New Brunswick, Canada) |
| APAB | Adjustable Pulmonary Artery Band (cardiology) |
| APAB | All-Primary/All-Backup |