| U/Pb | uranium/lead 
| Others |
| UPB | Ultimate PHP Board
| Others |
| UPB | Ultimate Powers Book
| Others |
| UPB | Uluslararasi Posta Birligi
| Others |
| UPB | Unamortized Principle Balance
| Others |
| UPB | Union Programming Board
| Others |
| UPB | Unique Perceived Benefit
| Others |
| UPB | United Pioneering Buisness
| Others |
| UPB | Universal Polymer Base
| Others |
| UPB | Universal Powerline Bus
| Others |
| UPB | Universally Preferable Behavior
| Others |
| UPB | Universally Preferable Behaviour
| Others |
| UPB | Universidad Pontificia Bolivariana
| Others |
| UPB | Universidad Privada Boliviana
| Others |
| UPB | University of Pittsburgh at Bradford
| Others |
| UPB | University of Pittsburgh Bradford
| Others |
| UPB | University of the Philippines Baguio
| Others |
| UPB | University Politehnica of Bucharest
| Others |
| UPB | University Press Books
| Others |
| UPB | University Program Board
| Others |
| UPB | University Programming Board
| Others |
| UPB | Unpaid Principal Balance
| Others |
| UPB | Unpaid Principle Balance
| Others |
| UPB | Uranium Pinto Beans
| Others |
| UPB | Urban Practices Branch
| Others |
| UPB | Utah Premiere Brass
| Others |
| UPB | UVM Program Board
| Others |