| IP |
Office of Infrastructure Protection (changed to ISD) |
| IPaC |
Information for Planning and Consultation (changed from Information, Planning, and Conservation; older link archive) |
| IPAD |
International and Philanthropic Affairs Division | International Production Assessment Division (older link archive) |
| IPAS |
Illicit Pathways Attack Strategy (older link archive) |
| IPAWS |
Integrated Public Alert & Warning System |
| IPCD |
Intermodal Passenger Connectivity Database (older link archive; archive2) |
| IPD |
Innovative Program Delivery (changed to CIFS) | International Programs Division |
| IPE |
Immunization Program Evaluation |
| IPEC |
Intellectual Property Enforcement Coordinator (unable to verify 2/21) |
| IPEDS |
Integrated Postsecondary Education Data System |
| IPEP |
Intellectual Property Theft Enforcement Program (older link archive) |
| IPI |
International and Philanthropic Innovation (changed to IPAD) |
| IPM |
Integrated Pest Management, FWS (unable to verify 2/16) | Integrated Pest Management, NIFA (older link archive) |
| IPP |
Import Permit Program (older link archive) | Innovative Partnerships Program (changed to ITPO) | Invoice Processing Platform |
| IPR Center |
National Intellectual Property Rights Coordination Center |
| IPRL |
Invasive Plant Research Laboratory (older link archive) |
| IPRP |
Interagency Pain Research Portfolio |
| IPS |
Images and Publications System, NCDC |
| IPTF |
Intellectual Property Task Force (unable to verify / website archived 1/22) |
| IPTU |
International Prisoner Transfer Program (older link archive) |
| IPY |
International Polar Year |
| IQCP |
Individualized Quality Control Plan |
| IQIP |
Immunization Quality Improvement for Providers |
| IRA |
Industry and Regional Analysis Division (unable to verify 10/19) |
| IRAC |
Interdepartment Radio Advisory Committee |
| IRAP |
International Research and Applications Project (older link archive; archive2; archive3) |
| IRAT |
Inorganic and Radiation Analytical Toxicology Branch |
| IRB |
Internal Revenue Bulletin (older link archive) |
| IRDA |
Informatics Research and Development Activity (unable to verify 6/14; likely replaced by DHIS) |
| IREPO |
Institutional Resilience and Expanded Postsecondary Opportunity program |
| IRG |
Intergovernmental Reference Guide |
| IRIS |
Immigration Records and Identity Services Directorate | Industrial Research and Development Information System (unable to verify 11/18; see archive) | Integrated Risk Information System | Interface Region Imaging Spectrograph |
| IRM |
Bureau of Information Resource Management (older link archive) | Internal Revenue Manual |
| IRMA |
Integrated Resource Management Applications |
| IRMCO |
Interagency Resources Management Conference (unable to verify 3/13) |
| IRP |
Intermediary Relending Program (older link archive) | Intramural Research Program |
| IRR |
Indian Reservation Roads (replaced by TTP; older link archive) |
| IRS |
Internal Revenue Service |
| IRS-CI |
Internal Revenue Service, Criminal Investigations (older link archive; archive2) |
| IRSOB |
IRS Oversight Board (unable to verify 4/22) |
| IRTM |
Division of Information Resources and Technology Management (older link archive) |
| IRWIN |
Integrated Reporting of Wildland-Fire Information |
