| LRB | Labeling Review Branch 
| Others |
| LRB | Laboratories for Reproductive Biology
| Others |
| LRB | Laboratory of Radiation Biology
| Others |
| LRB | Laboratory of Respiratory Biology
| Others |
| LRB | Laboratory Reagent Blank
| Others |
| LRB | Labour Relations Board
| Others |
| LRB | Lateral Resistance Of Ballasted
| Others |
| LRB | Lava Rock Barrel
| Others |
| LRB | Law Reporting Bureau
| Others |
| LRB | Le Roi Bisou
| Others |
| LRB | Lead Rubber Bearing
| Others |
| LRB | Lebanese Restraining Bend
| Others |
| LRB | Legal Remedy Brewing
| Others |
| LRB | Legislative Reference Bureau
| Others |
| LRB | Leonard Ryden Burr
| Others |
| LRB | License and Revenue Branch
| Others |
| LRB | Lightning Rod Ball
| Others |
| LRB | Liquid Refreshment Beverage
| Others |
| LRB | Liquid Rubber Base
| Others |
| LRB | Little Red Bus
| Others |
| LRB | Little River Band
| Others |
| LRB | Load Register Block
| Others |
| LRB | Local Review Board
| Others |
| LRB | Logistics Review Board
| Others |
| LRB | London Residuary Body
| Others |
| LRB | London Review of Books
| Others |
| LRB | London Review of Brooklyn
| Others |
| LRB | London Rifle Brigade
| Others |
| LRB | Lonesome River Band
| Others |
| LRB | Long Range Battery
| Others |
| LRB | Long Range Budget
| Others |
| LRB | Loop Reverse Battery
| Others |
| LRB | Love Runs Blind
| Others |
| LRB | Lymphatic Research and Biology
| Others |
| LRB | Lyndall Racing Brakes
| Others |