POSSE
| Acronym | Definition |
|---|---|
| POSSE | Portland Open Source Software Entrepreneurs |
| POSSE | Program of Ship Salvage Engineering (software package) |
| POSSE | Parental Obligation System for Support Enforcement |
| POSSE | Portable Open-Source Security Enhancements |
| POSSE | Parenting Our Successors in Society Effectively |
| POSSE | People of Success Stressing Excellence |
| POSSE | Preparing Outstanding Scholars for Special Education |