| Abbreviation | Definition |
|---|---|
| PTP | Point Park College, Pittsburgh, Pennsylvania, library code |
| PTPR | Pity The Poor Reader |
| PTR | Pay To Read |
| PUB | Publication |
| PublicHealthRep | Public Health Reports |
| PUDL | PHP Universal Database Library |
| PUDL | Princeton University Digital Library |
| PULL | Pop Up Laboratory Library |
| PULSE | The Partnership Uniting Libraries And Schools Electronically |
| PUP | Princeton University Press |
| PVC | Primitives Volumes and Collections |
| PVL | Photography Vision Library |
| PWPL | Peter White Public Library |
| PWT | Penn World Tables |
| q.v. | quod vide (Latin for "which see", i.e. "see also") |
| QAL | Quaid-e-Azam Library |
| QBulletinAssocFoodDrugOff.U.S. | Quarterly Bulletin of the Association of Food and Drug Officials of the U.S. |
| QCL | Queensland Compound Library |
| QDL | Qatar Digital Library |
| QDL | Quick Developing Library |