| Acronym | Definition |
|---|
| IIF | Institute of International Finance |
| IIF | Internal Improvement Fund (Florida) |
| IIF | International Islamic Front |
| IIF | Incoming Interface |
| IIF | Indirect Immunofluorescence |
| IIF | Innovation Investment Fund (investment supporting R&D new technology/science ventures) |
| IIF | Indian Institute of Finance (Delhi, India) |
| IIF | Input Interface |
| IIF | Irish Insurance Federation |
| IIF | Incident and Injury Free |
| IIF | Immediate IF |
| IIF | Intuit Interchange Format |
| IIF | Industrial and Infrastructure Fund Investment Corporation (Japan) |
| IIF | If and only If |
| IIF | Image Interchange Framework (digital motion picture production) |
| IIF | Informix Internet Foundation |
| IIF | Information in Identifiable Form |
| IIF | Illness, Injuries, Fatalities |
| IIF | Internal Interception Function (telecommunications) |
| IIF | Iraqi Intervention Forces |
| IIF | Islamic Information Foundation |
| IIF | If I Fell (Beatles song) |
| IIF | Interest Income Fund |
| IIF | Interworking Interoperability Function |
| IIF | Investors Iraq Forum |
| IIF | Image Interpretation Facility |