| BL&S | Boston Light and Sound 
| Others |
| BLS | B-Segment Luxury Sedan
| Others |
| BLS | Bachelor of Liberal Studies
| Others |
| BLS | Back Light Scanning
| Others |
| BLS | Backward Light Scatter
| Others |
| BLS | Bacon Lettuce Sandwich
| Others |
| BLS | barbaric life support (medical slang)
| Others |
| BLS | Bare Lymphocyte Syndrome
| Others |
| BLS | Basic Leadership School
| Others |
| BLS | Basic Life Support
| Others |
| BLS | Basic Line Services
| Others |
| BLS | Basic Linked System
| Others |
| BLS | Basics Lug Sh
| Others |
| BLS | Battery Life Saver
| Others |
| BLS | Bayes Least Squares
| Others |
| BLS | Beach Landing Site
| Others |
| BLS | Below Land Surface
| Others |
| BLS | Berkeley Linguistics Society
| Others |
| BLS | Best Life Support
| Others |
| BLS | Best Life Sweeheart
| Others |
| BLS | Big Liver and Spleen*
| Others |
| BLS | Big Load of S
| Others |
| BLS | Biggins Lacy Shapiro
| Others |
| BLS | Bill And Linda Speer
| Others |
| BLS | Biologics License Supplement
| Others |
| BLS | Bit Line Selector
| Others |
| BLS | Black Label Society
| Others |
| BLS | Black Label Suicides
| Others |
| BLS | Black Label Suicidesgeneral
| Others |
| BLS | Black Liquor Solids
| Others |
| BLS | Blind Loop Syndrome
| Others |
| BLS | Block Link Sets
| Others |
| BLS | Blood and Lymphatic System
| Others |
| BLS | Blown Like S***
| Others |
| BLS | BLS Basic Life Support
| Others |
| BLS | Blue Light Special
| Others |
| BLS | Blue Locker Society
| Others |
| BLS | Board of Laser Safety
| Others |
| BLS | Board on Life Sciences
| Others |
| BLS | Bob Lutz Special
| Others |
| BLS | Borland Licence Server
| Others |
| BLS | Boston Latin School
| Others |
| BLS | Botswana, Lesotho, & Swaziland
| Others |
| BLS | Bottom Left Side
| Others |
| BLS | Brake Light Switch
| Others |
| BLS | Branch if Lower or Same
| Others |
| BLS | Breadth Life Sciences
| Others |
| BLS | Brooklyn Law School
| Others |
| BLS | Buick Le Sabre
| Others |
| BLS | Bureau of Labor
| Others |
| BLS | Bureau of Labor and Statistics
| Others |
| BLS | Bureau of Labor Statistics
| Others |
| BLS | Business Leadership School
| Others |
| BLS | Business Licensing Service
| Others |
| BLS | Business Listing Service
| Others |
| BLS | Labor Statistics
| Others |