| Abbreviation | Definition |
|---|---|
| INT | Interior |
| INTAAWS | Integrated Air to Air Weapon Systems |
| INTAC | Individual Terrorism Awareness Course |
| INTACS | Integrated Tactical Communications System |
| INTCON | Interconnection |
| INTCONDIAG | Interconnection Diagram |
| INTEL | Intelligence |
| INTELSITSUM | Intelligence Situation Summary |
| InterAction | American Council For Voluntary International Action |
| INTERCO | International Code of Signals |
| INTERFET | INTERnational Force East Timor |
| INTEROP | Interoperability |
| INTEROP | Inter-operational |
| INTERPOL-USNCB | International Criminal Police Organization, United States National Central Bureau (DOJ) |
| INTREP | Intelligence Report |
| INTSUM | Intelligence Summary |
| INU | Inertial Navigation Unit |
| INU | Integration Unit |
| INV | Invalid |
| INVOF | In the Vicinity Of |