| Acronym | Definition |
|---|
| UPU➣United Postal Uniion (est. 1874) |
| UPU➣Union Postale Universelle (Universal Postal Union) |
| UPU➣Urban Popular University (est. 2006; International Alliance of Inhabitants) |
| UPU➣Unit Pusat Universiti (Malaysian Ministry of Education; department) |
| UPU➣User Part Unavailable (SS7) |
| UPU➣Universal Power Unit |
| UPU➣Universidad Popular Urbana (Spanish: Urban Popular University; Caracas, Venezuela) |