| Abbreviation | Definition |
|---|---|
| BSI | British Standard Institute |
| BSI | Brookfield Sustainability Institute |
| BSI | Butler Summer Institute |
| BSI | the British Standards Institution |
| BSIA | British Standards Institute Association |
| BSIA | Building Surveyors Institute of Australia |
| BSISF | Board of Studies of the Institute for Sustainable Futures |
| BSNI | Brain and Spine Neurosurgical Institute |
| BSPI | Bangladesh Sweden Polytechnic Institute |
| BSRI | Bard Summer Research Institute |
| BSRI | Bay State Reading Institute |
| BSRI | Behavioral Science Research Institute |
| BSRI | Blazer Summer Research Institute |
| BSRTI | Bangladesh Sericulture Research and Training Institute |
| BSRTI | Bangladesh Sericulture Research Training Institute |
| BSRTI | Bangladesh Silk Research and Training Institute |
| BSRTI | Bangladesh Sugarcane Research and Training Institute |
| BSTI | Bangladesh Standards and Testing Institute |
| BSTI | Bangladesh Standards and Testing Institution |
| BSTI | Berry Summer Thesis Institute |