| Abbreviation | Definition |
|---|---|
| PSHRS | Penn State Hotel Restaurant Society |
| PSHRS | Penn State Hotel & Restaurant Society |
| PSI | Paranormal Studies Institute |
| PSI | Parapsychology Studies Institute |
| PSI | Perimeter Scholars International |
| PSI | Personalized System of Instruction |
| PSI | Post Secondary Institution |
| PSI | Probability, Statistics, and Inference |
| PSI | Psychology Slander Intuition |
| PSI | Psychology Student Instructor |
| PSID | Philippine School of Interior Design |
| PSIP | Penn Student Insurance Plan |
| PSIP | Phoenix Student Interns Program |
| PSIS | Pailan School of International Studies |
| PSIS | Postsecondary Student Information System |
| PSJ | Pulliam School of Journalism |
| PSL | Physics Soccer League |
| PSM | Ponce School of Medicine |
| PSN | Public Service Network |
| PSO | Post Secondary Option |