| U/B | Under Bore 
| Others |
| UB | Music file Unsigned Byte
| Others |
| UB | The Universal Brotherhood
| Others |
| UB | U-Bolt
| Others |
| UB | Ubiquitin B
| Others |
| UB | UlaanBaatar
| Others |
| UB | Ulrich Boehmke
| Others |
| UB | Ultimate Babysitter
| Others |
| UB | Ultimate Bias
| Others |
| UB | Ultimate Blend
| Others |
| UB | Ultimate Bulletin
| Others |
| UB | Ultimobranchial Body
| Others |
| UB | Ultra Bae
| Others |
| UB | Ultra Bidoof
| Others |
| UB | Ultra Black
| Others |
| UB | Umbilical Blood
| Others |
| UB | Unblocked Becuase
| Others |
| UB | Unbound Bilirubin
| Others |
| UB | Uncle Bin
| Others |
| UB | Uncle Buck
| Others |
| UB | Unconjugated Bilirubin
| Others |
| UB | Undefined Behavior
| Others |
| UB | Under Bridge
| Others |
| UB | Unemployable Baker
| Others |
| UB | Unemployment Benefit
| Others |
| UB | Unemployment Benefit (now JSA)
| Others |
| UB | Unfinished Business
| Others |
| UB | Ungermann Bass
| Others |
| UB | Unidentified B
| Others |
| UB | Uniform Bill
| Others |
| UB | Uniform Billing
| Others |
| UB | Union Brothers
| Others |
| UB | Unique Browser
| Others |
| UB | United Boards
| Others |
| UB | United Brethren
| Others |
| UB | United Breweries
| Others |
| UB | Universal Balance
| Others |
| UB | Universal Banner
| Others |
| UB | Universal Beam
| Others |
| UB | Universal Bellows
| Others |
| UB | Universal Binary
| Others |
| UB | Universal Block
| Others |
| UB | Universal Bulkhead
| Others |
| UB | Universidad de Barcelona
| Others |
| UB | Universitat de Barcelona
| Others |
| UB | University at Buffalo
| Others |
| UB | University of Baltimore
| Others |
| UB | University of Botswana
| Others |
| UB | University of Buffalo
| Others |
| UB | Unna boot
| Others |
| UB | Unsigned Binary
| Others |
| UB | Unsigned Byte
| Others |
| UB | Unsupported Beliefs
| Others |
| UB | Unused Bit
| Others |
| UB | Upper Back
| Others |
| UB | Upper Basement
| Others |
| UB | Upper Berth
| Others |
| UB | Upper Body
| Others |
| UB | Upper Bound
| Others |
| UB | Upper Boundary
| Others |
| UB | Upper Bounds
| Others |
| UB | Upper Brace
| Others |
| UB | Uptight Bender
| Others |
| UB | Urban Background
| Others |
| UB | Urban Boundaries
| Others |
| UB | Ureteric Bud
| Others |
| UB | Urinary Bladder
| Others |
| UB | Urzad Bezpieczenstwa
| Others |
| UB | Utility Bike
| Others |
| UB | Utility Brakeman
| Others |
| UB | Utility Bridge
| Others |
| UB | You Better
| Others |