| Acronym | Definition |
|---|
| OFI | Ohne Finanzielle Interessen (German: Without Financial Interests; dating) |
| OFI | Oppenheimer Funds, Inc. |
| OFI | Orangutan Foundation International (Los Angeles, CA) |
| OFI | Oxford Forestry Institute |
| OFI | Open for Inspection (real estate) |
| OFI | Opportunity For Improvement |
| OFI | Oils and Fats Industry |
| OFI | Ornamental Fish International |
| OFI | Office of the Federal Interlocutor (Canada) |
| OFI | Other Financial Institution (banking cards) |
| OFI | Operational Flight Instrumentation (US NASA) |
| OFI | Off-Formulary Interchangable (drugs; Canada) |
| OFI | Optical Fiber Interface |
| OFI | Owner Furnished and Installed (various companies) |
| OFI | Office of Foreign Intelligence (US DOE) |
| OFI | Office of Fire Investigation |
| OFI | Organisation de la Femme Istiqlalienne (French) |
| OFI | Onset of Flow Instability |
| OFI | Omilos Filathlon Irakleiou (Greek footbal club; Heraklion, Crete) |
| OFI | Office of Fiscal Integrity (Florida) |
| OFI | Optical Fault Induction |
| OFI | Old Farts, Inc. (gaming clan) |