| S/NO | Abbr. | Meaning |
| 1 | BL | Bachelier en Loisirs (Bachelor of Leisure Studies) |
| 2 | BL | Bachelor of Law |
| 3 | BL | Bachelor of Letters (Bachelor of Arts – Japan) |
| 4 | B/L | Back Log |
| 5 | BL | Backlash |
| 6 | BL | Backlit |
| 7 | BL | Backlog |
| 8 | BL | Bad Luck (chat) |
| 9 | BL | Bale |
| 10 | Bl | Baltic (linguistics) |
| 11 | BL | Barrel |
| 12 | BL | Barrister-at-Law (UK) |
| 13 | BL | Bart’s and The London (School of Medicine and Dentistry, UK) |
| 14 | BL | Basal Lamina (biology) |
| 15 | BL | Basel Land (Basel Country; Suisse Half Canton) |
| 16 | B/L | Baseline |
| 17 | BL | Baseline |
| 18 | BL | Basel-Landschaft (canton postcode, Switzerland) |
| 19 | BL | Basic Load (ammunition) |
| 20 | BL | Bats Left (baseball) |
| 21 | B/L | Battery Limit |
| 22 | BL | Battery Limit |
| 23 | BL | Battle Lab |
| 24 | BL | Battle Laboratories |
| 25 | BL | Battle-Lemarie (wavelet families) |
| 26 | BL | Be Late |
| 27 | B/L | Beals, Lalonde and Associates (Ottawa, ON, Canada consulting group) |
| 28 | BL | Beam Line |
| 29 | BL | Beastlord (gaming, Everquest) |
| 30 | BL | Beautiful Lineswoman (Seinfeld TV show) |
| 31 | BL | Beauty Leopard (Geely sports car model) |
| 32 | BL | Bell Labs (Bell Telephone Laboratories) |
| 33 | BL | Bell Logger |
| 34 | BL | Belluno (Veneto, Italy) |
| 35 | BL | Belly Laugh |
| 36 | BL | Bend Loss |
| 37 | BL | Bereichsleiter/In (German: Director General) |
| 38 | BL | Beta Lamda |
| 39 | BL | Bibliography of the Lepidoptera |
| 40 | BL | Big Leaf (plant physiology) |
| 41 | BL | Big Log |
| 42 | BL | Big Lots (retail store sales quantity) |
| 43 | BL | Bikini-Line |
| 44 | B/L | Bilateral |
| 45 | BL | Bilateral |
| 46 | BL | Bilinear |
| 47 | B/L | Bill of Lading |
| 48 | BL | Bill of Lading |
| 49 | BL | Bin Laden |
| 50 | BL | Binder Library |
| 51 | BL | Biocontainment Level (US DoD) |
| 52 | BL | Bioluminescence |
| 53 | BL | Biosafety Level |
| 54 | BL | Bishops Lydeard (UK railway station) |
| 55 | BL | Bit Line (computer memory) |
| 56 | BL | Black |
| 57 | BL | Black Lagoon (Anime) |
| 58 | BL | Black Lotus (gaming, Magic The Gathering) |
| 59 | BL | Black Love |
| 60 | BL | Black Lung (Social Security) |
| 61 | BL | Blake Lively (actress) |
| 62 | BL | Blank |
| 63 | BL | Blanking |
| 64 | BL | Blast Load |
| 65 | BL | Blend |
| 66 | BL | Blessed (title of a beatified person) |
| 67 | BL | Blind (flange) |
| 68 | BL | Block |
| 69 | BL | Block Formatter |
| 70 | BL | Blockland (gaming) |
| 71 | BL | Bloco (Portuguese: block; postal usage) |
| 72 | BL | Blood Lust (gaming) |
| 73 | BL | Blower |
| 74 | BL | Blowing (METAR descriptor) |
| 75 | BL | Blue |
| 76 | BL | Body Language |
| 77 | BL | Body Lift (automotive) |
| 78 | BL | Bolaffi (philatelic dealers) |
| 79 | BL | Bolivia |
| 80 | BL | Bolton (postcode, United Kingdom) |
| 81 | BL | Bombline |
| 82 | BL | Bonney Lake (Washington) |
| 83 | BL | Borderlands (gaming) |
| 84 | BL | Borderline Lepromatous (leprosy) |
| 85 | BL | Boston Legal (US TV series) |
| 86 | BL | Bottom Line |
| 87 | BL | Boundary Layer |
| 88 | BL | Boylover (used by pedophiles) |
| 89 | BL | Boys Latin School of Maryland (Baltimore) |
| 90 | BL | Boys’ Life (Boy Scouts of America magazine) |
| 91 | BL | Boys’ Love (anime) |
| 92 | B/L | Branched to Linear (ratio) |
| 93 | BL | Breadth-Length |
| 94 | BL | Breaking Load (engineering) |
| 95 | BL | Breech Loading |
| 96 | BL | Bridge Latch |
| 97 | BL | British Leyland |
| 98 | BL | British Library (London, England) |
| 99 | BL | Broken Loop |
| 100 | BL | Bronzen Leeuw (Dutch) |
| 101 | BL | Bruce Lee |
| 102 | BL | Bud Light (beer) |
| 103 | BL | Buddy List |
| 104 | BL | Budget Line |
| 105 | BL | Building Line (construction) |
| 106 | BL | Buried Layer |
| 107 | BL | Burkitt Lymphoma |
| 108 | BL | Burkitt’s Lymphoma |
| 109 | BL | Burnlist (social networking game) |
| 110 | BL | Bush League |
| 111 | BL | Business Logic |
| 112 | BL | But Last (Hyper Logo command) |
| 113 | BL | Butt Line |
| 114 | BL | Buttock Line |