| Acronym | Definition |
|---|
| BEST | Board on Environmental Studies and Toxicology (National Academies Sciences, Engineering, and Medicine) |
| BEST | Board of European Students of Technology |
| BEST | Better Eaters Support Team (forum) |
| BEST | Biomonitoring of Environmental Status and Trends (Biological Resources Division, USGS) |
| BEST | Building Excellent Schools Today (Colorado) |
| BEST | Borland Enhanced Support and Training |
| BEST | Bioethanol for Sustainable Transport |
| BEST | Biomedical Excellence for Safer Transfusion (international research organization) |
| BEST | Better Environmentally Sound Transportation (Canada) |
| BEST | Boosting Engineering Science and Technology |
| BEST | Benefit Eligibility Screening Tool (US Social Security) |
| BEST | Basic English Skills Test |
| BEST | Bio Energetic Synchronization Technique (alternative health) |
| BEST | Bahamas Environment Science and Technology |
| BEST | Bio-Electrical Stimulation Therapy |
| BEST | Belize Enterprise for Sustainable Technology |
| BEST | Bureau of Emergency Services Telecommunications |
| BEST | Building Excellence in Science and Technology |
| BEST | Border Enforcement & Security Task Force |
| BEST | Bangui Evangelical School of Theology |
| BEST | Benefits and Entitlements Service Team |
| BEST | Better Engineering Students Today |
| BEST | Building Engagement, Strengths and Talent (US FEMA) |
| BEST | Bus Explosive Screening Technology |
| BEST | Bacon Egg Sausage Tomato (sandwich) |
| BEST | Black Employee Strategy Team (US NASA) |
| BEST | Building Essential Skills for Tomorrow |
| BEST | Berkeley Ecological and Safe Transportation (coalition) |
| BEST | Business Efficiency Solutions Today (UK) |
| BEST | Bare Essentials of Surface Transfer |
| BEST | Basic Essential Skills Test (US Army) |
| BEST | Biconditional Equalised Signal Tracking (JVC VCRs) |
| BEST | Bombay Electric Supply and Transport Company |
| BEST | Base Engineering Support, Technical |
| BEST | Business Employment Skills Training |
| BEST | Business Enhancement Services Team |
| BEST | Bandwidth Efficient Satellite Transport |
| BEST | Broadcast Engineering and Systems Technology (Engineering and I-T Division of CNN) |
| BEST | Bringing Everybody's Strengths Together |
| BEST | Building Enterprise Success Tomorrow |
| BEST | Boeing Employees' Stump Thumpers (4x4 club) |
| BEST | Benefits and Services Team |
| BEST | Bishops' Executive Secretaries Together |
| BEST | Business Equipment Software Techniques |
| BEST | Back-End Service Transaction |
| BEST | Booster Exhaust Study Test (NASA) |
| BEST | Black Efforts for Soul in Television |
| BEST | Box Elder Swim Team (Brigham City, UT, USA) |
| BEST | Barrio Eighteen Street (gang) |
| BEST | Bicol Experiment Station (Bicol, Philippines) |
| BEST | Brighton Eels Swim Team (Michigan) |
| BEST | Business Excellence Strategies and Techniques |
| BEST | Better Engineering Through Science and Technology |
| BEST | Basic Education Support Team |
| BEST | Bids Evaluation Support Tool |
| BEST | Built Environment Solutions and Technologies (UK) |
| BEST | Business Electronic Systems Techniques |
| BEST | Brainstem Encephalitis Support Team |
| BEST | Brihanmumbai Electric Supply and Transport LTD |
| BEST | Building Excellence In Supervisory Training (Sprint) |
| BEST | Ballastable Earthmoving Sectionalized Tractor |
| BEST | Bombay Electricity and State Transport |
| BEST | Broadening Experience Special Tour (USAF) |
| BEST | Balancing Government, Empowering People, Strengthening Families and Trust in Government |
| BEST | Basic Electromagnetic Simulation Tool |
| BEST | Battlefield Environment Simulation Toolkit |
| BEST | Better Electronic Service Technicians (training program) |
| BEST | Biographical Evaluation and Screening of Troops (US Air Force) |
| BEST | De Bruijn, Van Aardenne-Ehrenfest, Smith, Tutte (graph-theoretic theorem) |
| BEST | Boeing Employees Skeet & Trap |
| BEST | Battlespace Enhanced Survivability Technology |
| BEST | Baker Engineering Support Team (Baker Electronics) |
| BEST | Barrier Equals Strike |
| BEST | Better Estimation of Software Development Tasks |