| I/F | Interface 
| Others |
| IF | Conditional Batch file command
| Others |
| IF | Conditional statement (IF, THEN, ELSE)
| Others |
| IF | I Forgot :3
| Others |
| IF | Icetratt Foundation
| Others |
| IF | Idea Forum
| Others |
| IF | Ied Fabric
| Others |
| IF | If Fitted
| Others |
| IF | Image Frequency
| Others |
| IF | Imaginary Folklore
| Others |
| IF | Imaginary Friend
| Others |
| IF | Imaginary Friends
| Others |
| IF | Impact Factor
| Others |
| IF | Implicate Field
| Others |
| IF | In Fact
| Others |
| IF | In Flight
| Others |
| IF | Incorrigible Flirt
| Others |
| IF | Independence Friendly
| Others |
| IF | Independent Film
| Others |
| IF | Independent Force
| Others |
| IF | Individually Funded
| Others |
| IF | Industrial Facilities
| Others |
| IF | Industrial Filament
| Others |
| IF | Industrial Flat
| Others |
| IF | Industry Forum
| Others |
| IF | Inertial Fusion
| Others |
| IF | Infielder
| Others |
| IF | Infinite Flight
| Others |
| IF | Information Forager
| Others |
| IF | Information Foraging
| Others |
| IF | Informed Families
| Others |
| IF | Inherent Features
| Others |
| IF | Initial and Final
| Others |
| IF | Innovations And Fundamentals
| Others |
| IF | Input File
| Others |
| IF | Input Filter
| Others |
| IF | Inside Film
| Others |
| IF | Instruction Fetch
| Others |
| IF | Integration Facility
| Others |
| IF | Intelligence Fusion
| Others |
| IF | Intelligent Finance
| Others |
| IF | Interactive Fiction
| Others |
| IF | Interdependent Film
| Others |
| IF | Interest Factor
| Others |
| IF | Interface From
| Others |
| IF | Interference Field
| Others |
| IF | Intermediate Filament
| Others |
| IF | Intermediate Fix
| Others |
| IF | Intermediate Frequency
| Others |
| IF | Intermittent Fasting
| Others |
| IF | Internal Focus
| Others |
| IF | Internal Focusing
| Others |
| IF | Internally Flawless
| Others |
| IF | Internally Focused
| Others |
| IF | International Falls
| Others |
| IF | International Federation
| Others |
| IF | International Fleet
| Others |
| IF | Internet Friend
| Others |
| IF | Interrupt Flag
| Others |
| IF | Interstate Financial
| Others |
| IF | Interstitial Fluid
| Others |
| IF | Intrinsic Field
| Others |
| IF | Intuitionistic Fuzzy
| Others |
| IF | Inventing Future
| Others |
| IF | Inventing The Future
| Others |
| IF | Inverse Filtered
| Others |
| IF | Inverse Fourier
| Others |
| IF | Invincible Fellowship
| Others |
| IF | Iraqi Freedom
| Others |
| IF | Ironforge (World of Warcraft city)
| Others |
| IF | Is Defined
| Others |
| if | islamic foundation:a bangla governmental organization for promoting islam in bangladesh.
| Others |
| IF | Isotta Fraschini
| Others |
| IF | It's For ....
| Others |