| Acronym | Meaning |
| APL | Applied Physics Laboratory |
| APL | Above Poverty Line (India) |
| APL | Acceptable Performance Levels |
| APL | Acquisition Policy Letter |
| APL | Additional Paternity Leave |
| APL | Aide Personnalisée Au Logement (French: personalized housing subsidy) |
| APL | Airplane |
| APL | Airport Lights |
| APL | All-Purpose Liquid |
| APL | Allowance Parts List |
| APL | Allowance Parts List (IIS) |
| APL | Alternative Pollutant Limit(s) |
| APL | Ambulance Platoon Leader |
| APL | Anti-Personnel Landmines |
| APL | Application Parts List |
| APL | Applied Psychological Laboratory (India, Defence Institute of Psychological Research) |
| APL | Approved Parts List |
| APL | Approved Product List |
| APL | Approved Products List |
| APL | Approved Project List (various locations) |
| APL | Army Personnel Letter |
| APL | Army Promotion List |
| APL | Assembly Parts List |
| APL | Association of Police Lawyers (UK) |
| APL | Atomic Power Laboratory |
| APL | Authorized Price List |
| APL | Average Picture Level |
| APL | Barracks Craft (Non Self-Propelled) |