| Abbreviation | Definition |
|---|---|
| INDD | Intra-Nodal Data Distribution |
| INDRAC | Interagency Combating Weapons of Mass Destruction Database of Responsibilities, Authorities, and Capabilities |
| INDRSA | Independent Reserve Storage Activity |
| INEWS | Integrated Electronic Warfare System |
| INF | Infantry |
| INF | Intermediate Nuclear Forces |
| INFLTREP | Inflight Report |
| INFO | Information |
| INFOCON | Information Operations Condition |
| INFOSEC | Information Security |
| INFOSEC | Information System Security |
| ING | Inactive National Guard |
| ING | Iraqi National Guard |
| INID | Intercept Network In Dialing |
| INJILL | Injured or Ill |
| INL | Bureau For International Narcotics and Law Enforcement Affairs (DOS) |
| INLA | Irish National Liberation Army |
| INM | International Narcotics Matters |
| INMARSAT | International Maritime Satellite |
| INR | Bureau of Intelligence and Research, Department of State |