PCIO
| Acronym | Definition |
|---|---|
| PCIO | Philadelphia College and Infirmary of Osteopathy (est. 1899; Philadelphia, PA) |
| PCIO | Prophylactic Cranial Irradiation Overview |
| PCIO | Provincial Criminal Investigations Officer (Kenya) |
| PCIO | Program Controlled Input/Output |
| PCIO | Plasma Clearance of Iohexol (veterinary research) |