| Acronym | Definition |
|---|
| BAR | Browning Automatic Rifle |
| BAR | BRAIN (Broadband Radio Access for IP-based Networks) Access Router |
| BAR | Barbados |
| BAR | Barrel |
| BAR | Barometer |
| BAR | Baruch (book of the Protestant Apocrypha) |
| BAR | Bay Area Reporter (San Francisco, CA) |
| BAR | Best Available Rate |
| BAR | Bachelor of Architecture |
| BAR | Biblical Archaeology Review |
| BAR | British Association of Removers |
| BAR | Beyond All Recognition |
| BAR | Baritone Saxophone |
| BAR | Bureau of Automotive Repair |
| BAR | British American Racing (formula 1 racing team) |
| BAR | Bureau of Agricultural Research (Philippines) |
| BAR | Base Address Register |
| BAR | Billing and Accounts Receivable |
| BAR | Brigade of the American Revolution |
| BAR | Beta-2-Adrenoceptor |
| BAR | Bangor and Aroostook Railroad |
| BAR | Bureau of Archaeological Research (Florida) |
| BAR | Bulk Acoustic Resonator |
| BAR | Business Analysis Requirements |
| BAR | Builders All Risk (Insurance) |
| BAR | Bit Aspect Ratio |
| BAR | Buffer Address Register |
| BAR | Broad Area Review |
| BAR | Bright, Alert and Responsive |
| BAR | British Accreditation Regency |
| BAR | Basins At Risk (freshwater research project) |
| BAR | Blade Area Ratio |
| BAR | Broadband Aggregation Router (Pannaway Technologies) |
| BAR | Board of Appeals & Review |
| BAR | Best All-Around Racer |
| BAR | Broadcast Advertisers Reports |
| BAR | Business Account Representative |
| BAR | Battery Acquisition Radar |
| BAR | Business Analysis Review |
| BAR | Buoyancy Air Releases (SCUBA diving) |
| BAR | Bid Analysis Report |
| BAR | Business Area Representative |
| BAR | Business Activity Register |
| BAR | Bureau of Aeronautics Representative |
| BAR | Bimonthly Activity Report |
| BAR | Barrett Junction, California (earthquake reporting station) |
| BAR | Beep, Alarm, Ring |
| BAR | Business Assurance Reviews |
| BAR | Basic Associate Renewal |
| BAR | Backbone Attaching Router |