| Acronym | Definition |
|---|
| PIU | Push It Up |
| PIU | Project in Use (Italian professional network) |
| PIU | Pump It Up (dance simulation game series) |
| PIU | Project Implementation Unit |
| PIU | Praktik i Udlandet (Danish: Internship Abroad) |
| PIU | Performance and Innovation Unit (UK) |
| PIU | Processor Identification Utility |
| PIU | Percent Interstate Usage |
| PIU | Path Information Unit |
| PIU | Petersen International Underwriters (insurance; Valencia, CA) |
| PIU | Professional Issues Updates (accounting) |
| PIU | Peace and International Understanding |
| PIU | Programme Implementation Unit |
| PIU | Problematic Internet Use (psychology) |
| PIU | Power Interface Unit |
| PIU | Public Inquiry Unit (California) |
| PIU | Photographic Interpretation Unit (US Navy) |
| PIU | Public Interest Unit (UK) |
| PIU | Programmable Interface Unit |
| PIU | Payload Interface Unit |
| PIU | PCM Interface Unit (Cisco) |
| PIU | Peripheral Interface Unit |
| PIU | Particle Instrumentation Unit (US EPA Particle Center) |
| PIU | Protocol Interface Unit |
| PIU | Protection Interface Unit (Intel Corporation) |
| PIU | Port Interface Unit |
| PIU | Pylon Interface Unit |