| I | Amperage  
| Measurement Unit, Electricity |
| I | Borland C Preprocessor, Preprocessor output file
| Computer Programming |
| I | Ice
| Matter State |
| I | Identical
| Others |
| I | Idiosyncratic
| Others |
| I | Immediate
| Others |
| I | In
| Others |
| I | Incinerator
| Others |
| I | Inclusive
| Others |
| I | Incubate
| Others |
| I | Independent
| Others |
| I | Individual
| Others |
| I | Inebriation
| Others |
| I | Ineligible
| Others |
| I | Inertia
| Physics |
| I | Injection
| Others |
| I | Inlay
| Others |
| I | Inner
| Others |
| I | Innovation
| Others |
| I | Insecure
| Others |
| I | Integrity
| Others |
| I | Intelligence Fusion (Integrator)
| Others |
| I | Intensity
| Others |
| I | Intercession
| Others |
| I | Interest
| Others |
| I | Interior
| Others |
| I | Internal
| Others |
| I | Internationalism
| Others |
| I | Intersection
| Others |
| I | Intimidated
| Others |
| I | Introduction
| Others |
| I | Inverted
| Others |
| I | Iodine
| Element |
| I | Irradiated
| Others |
| I | Irresistible
| Others |
| I | Irritant
| Others |
| I | Island
| Territory |
| I | Phase Vocoder Analysis data
| Science |
| I | Roman numeral 1
| Number |
| I | SERIOUS INJURY - SEND DOCTOR
| Medical |
| I & D | Incision and Drainage
| Medical |
| I & O | Intake and Output
| Medical |
| I & OP | Industrial And Organizational Psychology
| Science |
| I and C | Instrumentation and Communication
| Technology |
| I HOPE TO SHOUT | Means "about time" or "I couldn't agree more"
| Others |
| I LOAD | Initialization LOAD
| Computer Programming |
| I%/V | Secret Interest Formula:
| Others |
| I&A | Identification & Authentication
| Technology, Security |
| I&A | Office of Intelligence and Analysis
| Security |
| I&B | Information and Broadcasting
| Agency, Ministry |