| Acronym | Definition |
|---|
| PFI | Pay for Inclusion (web search engines) |
| PFI | Private Finance Initiative |
| PFI | Private Finance Initiative (UK) |
| PFI | Priority for Improvement (various organizations) |
| PFI | Power Factor Improvement |
| PFI | Prison Fellowship International |
| PFI | Port Fuel Injection |
| PFI | Partition from Image |
| PFI | Pay for Inclusion |
| PFI | Port Fuel Injection (engines) |
| PFI | Performance Freediving International |
| PFI | Practical Farmers of Iowa |
| PFI | Pet Food Institute |
| PFI | Public Finance Initiative |
| PFI | Primary Financial Institution |
| PFI | Pipe Fabrication Institute |
| PFI | Personnel Force Innovation (US DoD) |
| PFI | Pellet Fuels Institute |
| PFI | Paul Frank Industries (California) |
| PFI | Pagan Federation International |
| PFI | Presence From Innovation LLC |
| PFI | Partnerships for Inclusion |
| PFI | Pro-Forma Invoice (Customs) |
| PFI | Prospective Financial Information |
| PFI | Pharma Foods International (Japan) |
| PFI | Pandemic Flu Information (forum) |
| PFI | Patapsco Female Institute (Maryland) |
| PFI | Permanent Functional Impairment |
| PFI | Public Financial Institution (India) |
| PFI | Performance Feel Index (automotive engineering) |
| PFI | Prismaflex International |
| PFI | Performance Factor Interview |
| PFI | Pill-Free Interval (combined oral contraceptive pill) |
| PFI | Power Fail Interrupt |
| PFI | Payload FCS (Frame Check Sequence) Indicator |
| PFI | Purolator Facet, Inc. (Franklin, TN) |
| PFI | Pastoral Formation Institute |
| PFI | Programmable Function Input |
| PFI | Positive Financial Impact |
| PFI | Pagtinabangay Foundation, Inc. |
| PFI | Personal Finance Initiative |
| PFI | Pre-Fire Inspection |
| PFI | Partial Frame Image |
| PFI | Private Fax Interface |
| PFI | Pristane Formation Index (molecular maturity parameter) |