UPU
| 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) |