| Abbreviation | Definition |
|---|---|
| PSA | Professional Squash Association |
| PSAA | Pennsylvania Ski Area Association |
| PSAA | Philippine Ship Agents Association |
| PSAA | Professional Service Advisors Association |
| PSAA | Puget Sound Adjusters Association |
| PSAI | Political Studies Association Of Ireland |
| PSAI | Portable Sanitation Association International |
| PSAM | Professional Speakers Association Of Michigan |
| PSATS | Pennsylvania State Association Of Township Supervisors |
| PSC | Project Steering Committee |
| PSCT | Professional Standards Commission for Teachers |
| PSDA | Print Services & Distribution Association |
| PSDA | Public Safety Divers Association |
| PSDE | Pakistan Society of Development Economists |
| PSE | Pittsburgh Social Exchange |
| PSI | Pet Sitters International |
| PSI | Pharmaceutical Society of Ireland |
| PSI | Psychological Society of Ireland (Cumann Siceolaithe Eireann) |
| PSIA | Penn State Investment Association |
| PSMT | Perimeter Security Maintenance Technologies |