| PESS | Paediatric endoscopic sinus surgery 
| Others |
| PESS | Patient Education Support Services
| Others |
| PESS | Pessary
| Others |
| PESS | Petroleum Engineering Summer School
| Others |
| PESS | Physical Education And School Sport
| Others |
| PESS | Physical Education And Sport Science
| Others |
| PESS | Physical Education And Sport Sciences
| Others |
| PESS | Physical Education and Sports Science
| Others |
| PESS | Planning and Economic Studies Section
| Others |
| PESS | Planning Economic Studies Section
| Others |
| PESS | Post Enucleation Socket Syndrome
| Others |
| PESS | Postsecondary Education Services and Support
| Others |
| PESS | Power Engineering Services and Solutions
| Others |
| PESS | Private Equity Software and Services
| Others |
| PESS | Pro Evolution Sweg Soccer
| Others |
| PESS | Professional Engineering Services Schedule
| Others |
| PESS | Programmable Electronic Safety Systems
| Others |
| PESS | Programmable Electronic Sub Systems
| Others |
| PESS | Project Education South Sudan
| Others |
| PESS | Project Execution Support System
| Others |
| PESS | Prolog Expert System Shell
| Others |
| PESS | Property Essential To Self Support
| Others |
| PESS | Psychiatric Emergaency Screening Service
| Others |
| PESS | Psychiatric Emergency Screening Service
| Others |
| PESS | Psychiatric Emergency Screening Services
| Others |
| PESS | Psychiatric Emergency Service System
| Others |
| PESS | Public Employees Social Security
| Others |
| PESS | Public Employees' Social Security
| Others |