| Acronym | Definition |
|---|
| BR | Brown |
| BR | Brasil/Brazil (top level domain) |
| BR | Bedroom |
| BR | Best Regards |
| BR | Brother |
| BR | Break (HTML) |
| BR | British Rail |
| BR | Britain |
| BR | Brass |
| BR | British Railways (company) |
| BR | Business Registration |
| BR | Mist (Meteorological Report) |
| BR | Bromine |
| BR | Broker Reciprocity (real estate) |
| BR | Build Report |
| BR | Bromley (postcode, United Kingdom) |
| BR | Bundesrat (Austrian Parlamentary Institution) |
| BR | Birth Rate |
| BR | Budget Report |
| BR | Business Register |
| BR | Base Register |
| BR | Butadiene Rubber (polybutadiene rubber) |
| BR | Brigate Rosse (Italian Terrorist Group) |
| BR | Petrobrás Distribuidora (Brazil) |
| BR | Bureau of Reclamation |
| BR | Business Roundtable |
| BR | Brindisi, Puglia (Italian province) |
| BR | Broad Ripple (Indiana) |
| BR | Radiocommunication Bureau |
| BR | budget review (US DoD) |
| BR | Breeder Reactor |
| BR | Burst Rate (data communications) |
| BR | Bridleway (UK planning & zoning) |
| BR | Business Result |
| BR | Eva Airways Corporation (IATA airline code) |
| BR | Builder's Risk |
| BR | Buffer Register |
| BR | Breastroke (swimming) |
| BR | Brigade de Recherche (French: Research Brigade) |
| BR | Banque de la Réunion (French: Bank of Reunion) |
| BR | Business Reform |
| BR | Break Rate |
| BR | Brother Rat |
| BR | Bomber Reconnaissance |
| BR | Banlieue Rouge (Quebec punk band) |
| BR | Bâtiment Réacteur (French: Reactor Building) |
| BR | Butadiene Resin |
| bR | Bitte Rücksprache (German: Please Contact) |
| BR | Buddy Ride |
| BR | Bottom Reflection |
| BR | Blade Rate |
| BR | Buffalo Regals |
| BR | Break Relay |
| BR | Backward Reporting |
| BR | Bridgewire Resistance |
| BR | Bahama Route |
| BR | Bloc Réacteur (French: Reactor Unit) |
| BR | Battle Rezz (gaming) |
| BR | Brandenberger+Ruosch AG |
| BR | Babe Ruth (baseball player) |
| BR | Battery Return |
| BR | Batch Reactor (chemical reactor where volume is constant and the contents are well-mixed) |
| BR | Battle Royale (Japanese movie) |
| BR | Bottle Rockets (band) |
| BR | Blackground Records (record label) |
| BR | Bidirectional Ring |
| BR | Banco Reformador |
| BR | Bangladesh Railway |
| BR | Bairro (Portuguese postal use) |
| BR | Binary Restenosis |
| BR | Blood Rayne (video game) |
| BR | Bombing Run (Unreal Tournament 2003 game mode) |
| BR | Boys Rule |
| BR | Black Reign (TNA iMPACT gaming wrestler) |
| BR | Bellevue Reporter (community newspaper) |
| BR | Bandwidth Request |
| BR | Book of Reference |
| BR | BluRay (Disc) |
| BR | Banana Republic (clothing store) |
| BR | Battle Rifle (gaming, Halo) |
| BR | Boilermaker (USN Rating) |
| BR | Bong Rip |
| BR | Branch |
| BR | Bills Receivable |
| BR | Biological Research |
| BR | Bit Rate |
| BR | Bacteriorhodopsin |
| BR | Bad Register |
| BR | Bad Religion (band) |
| BR | Bank Roll |
| BR | Basic Research |
| BR | Bathroom Reader |
| BR | Bats Right (baseball) |
| BR | Baskin Robbins (ice cream stores) |
| BR | Bayerischer Rundfunk (Southern German Radio Station) |
| BR | Batch Record (pharmaceutical product recipe) |
| BR | Beam Rifle (anime, Mobile Suit Gundam) |
| BR | Black Adder |
| BR | Baloch Regiment (Pakistan) |
| BR | Bari (postal region, Somalia) |
| BR | Battle Realms (PC game) |
| BR | Bohemian Rhapsody |
| BR | Blue Rodeo (band) |
| BR | Bedrest |
| BR | Boca Raton (Florida) |
| BR | Baton Rouge |
| BR | Bend Radius (cable flexibility) |
| BR | Blockade Runner (game) |
| BR | Bharat Rakshak |
| BR | Blackburn Rovers |
| BR | Blonde Redhead (band) |
| BR | Batman Returns (1992 movie) |
| BR | Bloody Roar (video game) |
| BR | Boundary Representation |
| BR | Biological and Radiological |
| BR | Blade Runner (movie) |
| BR | Bible Review |
| BR | Backbone Router |