| BESA | Baguio English Schools Association 
| Others |
| BESA | Basic Equipment Skills Assessment
| Others |
| BESA | Baskin Engineering Student Ambassadors
| Others |
| BESA | Battery Electrical System Analyser
| Others |
| BESA | Bedford Euless Soccer Association
| Others |
| BESA | Besasie Automobile
| Others |
| BESA | Bilingual English Spanish Assessment
| Others |
| BESA | Biomedical Engineering Student Association
| Others |
| BESA | Border Epidemiologic Study of Aging
| Others |
| BESA | Brain Electric Source Analysis
| Others |
| BESA | Brain Electrical Source Analysis
| Others |
| BESA | Bright European Skateboard Awards
| Others |
| BESA | British Educational Suppliers Association
| Others |
| BESA | British Electrical Systems Association
| Others |
| BESA | British Engineering Standards Association
| Others |
| BESA | British Esperanto Scientific Association
| Others |
| BESA | Building and Engineering Services Association
| Others |
| BESA | Building Energy Simulation Analyst
| Others |
| BESA | Building Engineering Services Association
| Others |