| PCI | Peripheral Component Interconnect | - | Computer Acronyms(common) |
| PCI | Positive-ion Chemical Ionization (mass Spectrometry) | - | Computer Acronyms(common) |
| PCI | Percutaneous Coronary Intervention | - | Computer Acronyms(common) |
| PCI | Perturbative Configuration Interaction | - | Computer Acronyms(common) |
| PCI | Peripheral Component Interconnect | - | Computer and Internet |
| PCI | Peripheral Component Interface | - | Human Genome |
| PCI | Peripheral Controller Interface | - | Organizations |
| PCI | Procedure Change Unit | - | Organizations |
| PCI | Product Configuration Identification | - | Organizations |
| PCI | Program Control Input | - | Organizations |
| PCI | U.S. Pacific Islands Trust Territory (ISO 3166 Trigram; Obsolete 1986) -Peripheral Component Interconnect (computer Bus) | - | Astronomy |
