| Acronym | Meaning |
 | HRSA | Health Resources And Services Administration |
| HSB | Head Start Bureau |
| HUD | Department Of Housing And Urban Development |
| IA | Import Administration |
| IACB | Indian Arts And Crafts Board |
| IADRWG | Interagency Alternative Dispute Resolution Working Group |
| IAEA | International Atomic Energy Agency |
| IAEGC | Inter-Agency Electronic Grants Committee |
| IAF | Inter-American Foundation |
| IBB | International Broadcasting Bureau |
| ICAF | Industrial College Of The Armed Forces |
| ICAO | International Civil Aviation Organization |
| ICC | Interstate Commerce Commission |
| IES | Institute Of Education Sciences |
| IHS | Indian Health Service |
| IIP | International Information Programs |
| ILAB | Bureau Of International Labor Affairs |
| ILO | International Labour Organization |
| IMF | International Monetary Fund |
| IMLS | Institute Of Museum And Library Services |
| INEEL | Idaho National Engineering And Environmental Laboratory |
| INF | Intermediate Range Nuclear Forces |
| INL | Bureau For International Narcotics And Law Enforcement Affairs |
| INS | Immigration And Naturalization Service (replaced By USCIS) |
| INSS | Institute For National Strategic Studies |
| INTERPOL | International Criminal Police Organization |
| IO | Bureau Of International Organization Affairs |
| IOM | International Organization For Migration |
| IRMC | Information Resources Management College |
| IRS | Internal Revenue Service |
| ITA | International Trade Administration |
| ITC | United States International Trade Commission |
| JAG | Judge Advocate General |
| JCS | Joint Chiefs Of Staff |
| JEC | Joint Economic Committee |
| JFSC | Joint Forces Staff College |
| JPL | Jet Propulsion Laboratory |
| JSC | Johnson Space Center |
| KAPL | Knolls Atomic Power Laboratory |
| KSC | Kennedy Space Center |
| LANL | Los Alamos National Laboratory |
| LBL | Ernest Orlando Lawrence Berkeley National Laboratory |
| LC | Library Of Congress |
| LLNL | Lawrence Livermore National Laboratory |
| LOC | Library Of Congress |
| LOCIS | Library Of Congress Information System |
| LSC | Legal Services Corporation |
| MAC | Market Access And Compliance |
| MARAD | Maritime Administration |
| MARVEL | Machine Assisted Realization Of The Virtual Electronic Library |
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