| Acronym | Definition |
|---|
| BIO | Biography |
| BIO | Biology |
| BIO | Biological |
| BIO | Biotechnology Industry Organization |
| BIO | Biodegradable |
| BIO | By Invitation Only |
| BIO | Bedford Institute of Oceanography |
| BIO | Bring It On (Counter-Strike gaming clan) |
| BIO | Bring It On |
| BIO | Bioseparation |
| BIO | Binocular Indirect Ophthalmoscopy (eyes) |
| BIO | Basic Input Output |
| BIO | Blow It Off |
| BIO | Biological Hazard (fire diamond warning code) |
| BIO | Biotech Industry Organization |
| BIO | Binocular Indirect Ophthalmoscope |
| BIO | Building Inspection Office (various locations) |
| BIO | Business Integration Office (US DoD) |
| BIO | Business Information Optimization (software) |
| BIO | Business Information Officer |
| BIO | Bureau of International Organizations (US DoD) |
| BIO | Binary Input/Output |
| BIO | Basis for Interim Operation |
| BIO | British Informatics Olympiad |
| BIO | Bilbao, Spain - Sondica (Airport Code) |
| BIO | Biology Break (chat, going to the bathroom) |
| BIO | Bio Research Module (NASA) |
| BIO | Biomechanical Integrated Organism (robotics) |
| BIO | Biological Information Processing Association |
| BIO | Branch Intelligence Officer |
| BIO | Broadcast Input Output |
| BIO | Bitronics Input/Output (computer networking) |