| Acronym | Definition |
|---|
| BL | Barrel |
| BL | Bill of Lading |
| BL | Baseline |
| BL | Black |
| BL | Blue |
| BL | Bilateral |
| BL | Block |
| BL | British Library (London, England) |
| BL | Basel-Landschaft (canton postcode, Switzerland) |
| BL | Basel Land (Basel Country; Suisse Half Canton) |
| BL | Blank |
| BL | Boys' Life (Boy Scouts of America magazine) |
| BL | Blind (flange) |
| BL | Boys' Love (anime) |
| BL | Bloco (Portuguese: block; postal usage) |
| BL | Bolivia |
| BL | Blend |
| BL | Blessed (title of a beatified person) |
| BL | Blowing (METAR descriptor) |
| BL | Baltic (linguistics) |
| BL | Bottom Line |
| BL | Borderlands (gaming) |
| BL | Backlash |
| BL | Blake Lively (actress) |
| BL | Black Love |
| BL | Bin Laden |
| BL | Bolton (postcode, United Kingdom) |
| BL | Belluno (Veneto, Italy) |
| BL | Blanking |
| BL | Big Lots (retail store sales quantity) |
| BL | Bale |
| BL | Bruce Lee |
| BL | Boundary Layer |
| BL | Blower |
| BL | Body Language |
| BL | Black Lagoon (Anime) |
| BL | Boston Legal (US TV series) |
| BL | Bad Luck (chat) |
| BL | Backlit |
| BL | Bachelor of Letters (Bachelor of Arts - Japan) |
| BL | Buddy List |
| BL | Building Line (construction) |
| BL | Backlog |
| BL | Big Leaf (plant physiology) |
| BL | Bush League |
| BL | Bud Light (beer) |
| BL | British Leyland |
| BL | Bell Labs (Bell Telephone Laboratories) |
| BL | Business Logic |
| BL | Blockland (gaming) |
| BL | Belly Laugh |
| BL | Burkitt's Lymphoma |
| BL | Bart's and The London (School of Medicine and Dentistry, UK) |
| BL | Beam Line |
| BL | Be Late |
| BL | Bilinear |
| BL | Burkitt Lymphoma |
| BL | But Last (Hyper Logo command) |
| BL | Blast Load |
| BL | Bioluminescence |
| BL | Black Lung (Social Security) |
| BL | Body Lift (automotive) |
| BL | Basal Lamina (biology) |
| BL | Boylover (used by pedophiles) |
| BL | Biosafety Level |
| BL | Breech Loading |
| BL | Budget Line |
| BL | Breaking Load (engineering) |
| BL | Bit Line (computer memory) |
| BL | Blood Lust (gaming) |
| BL | Barrister-at-Law (UK) |
| BL | Bonney Lake (Washington) |
| BL | Black Lotus (gaming, Magic The Gathering) |
| BL | Battle Lab |
| BL | Bikini-Line |
| BL | Bachelor of Law |
| BL | Borderline Lepromatous (leprosy) |
| BL | Big Log |
| BL | Basic Load (ammunition) |
| BL | Bolaffi (philatelic dealers) |
| BL | Biocontainment Level (US DoD) |
| BL | Bishops Lydeard (UK railway station) |
| BL | Bats Left (baseball) |
| BL | Beastlord (gaming, Everquest) |
| BL | Battery Limit |
| BL | Bachelier en Loisirs (Bachelor of Leisure Studies) |
| BL | Buried Layer |
| BL | Burnlist (social networking game) |
| BL | Boys Latin School of Maryland (Baltimore) |
| BL | Beauty Leopard (Geely sports car model) |
| BL | Bereichsleiter/In (German: Director General) |
| BL | Bronzen Leeuw (Dutch) |
| BL | Breadth-Length |
| BL | Butt Line |
| BL | Buttock Line |
| BL | Bend Loss |
| BL | Binder Library |
| BL | Battle-Lemarie (wavelet families) |
| BL | Broken Loop |
| BL | Block Formatter |
| BL | Bombline |
| BL | Beautiful Lineswoman (Seinfeld TV show) |
| BL | Bridge Latch |
| BL | Beta Lamda |
| BL | Battle Laboratories |
| BL | Bell Logger |
| BL | Bibliography of the Lepidoptera |