| Acronym | Definition |
|---|
| PIWG | Propulsion Instrumentation Working Group (test instrumentation and sensor technology) |
| PIWG | Product Improvement Working Group |
| PIWG | Pilot Implementation Working Group |
| PIWG | Performance Indicators Working Group (UK Office of the Deputy Prime Minister Fire and Rescue improvement program) |
| PIWG | Performance Interface Working Group |
| PIWG | Platform Integration Working Group |
| PIWG | Performance Issues Working Group of ACM SIGAda |
| PIWG | Product Integration Working Group |
| PIWG | Performance Indicator Workgroup (Washington State Department of Social and Health Services) |
| PIWG | Public Involvement Workgroup (Clackamas County, Oregon) |
| PIWG | Proton Intensity Working Group (nuclear physics) |
| PIWG | Parlay Industry Working Group |
| PIWG | Partnering Implementation Working Group (UK) |