| Acronym | Meaning |
 | IQ | Idem Quod (Latin |
| IQ | Intelligence Quotient -Iraq (ISO 3166 Digram) |
| IQD | Iraqi Dinar (ISO 4217 Currency Code) |
| IR | Infrared - Intelligence Requirement (military) -Iran (FIPS 10-4 Country Code; ISO 3166 Digram) - Iran Air (IATA Alpha Code) See Entry For More |
| IR | Iridium |
| IRA | Individual Retirement Account (legally |
| IRAS | Infrared Astronomical Satellite |
| IRB | International Rugby Board |
| IRBM | Intermediate Range Ballistic Missile |
| IRC | International Red Cross - International Reply Coupon - Internet Relay Chat |
| IREA | Intermountain Rural Electric Association |
| IRL | Ireland (ISO 3166 Trigram) - Industrial Research Limited |
| IRM | Illinois Railway Museum - Inzhenernaya Razvedyvatelnaya Mashina (Russian ?????????? ???????????????? ?????? |
| IRN | Iran (ISO 3166 Trigram) |
| IRO | International Refugee Organisation |
| IRQ | Iraq (ISO 3166 Trigram) |
| IRR | Iranian Rial (ISO 4217 Currency Code) |
| IRS | U.S. Internal Revenue Service |
| IRSN | Institut De Radioprotection Et De S?ret? Nucl?aire (French |
| IRST | Infra-red Search And Track |
| IS | Iceland (ISO 3166 Digram) - Israel (FIPS 10-4 Country Code) |
| IS | Icelandic Language (ISO 639-1 Code) |
| ISA | Individual Savings Account - Industry Standard Architecture - Instruction Set Architecture - International Seabed Authority |
| ISAAA | International Service For The Acquisition Of Agri-biotech Applications |
| ISAF | International Sailing Federation - International Security Assistance Force |
| ISAR | Inverse SAR (Synthetic Aperture Radar) |
| ISB | Intermediate Staging Base |
| ISBN | International Standard Book Number (ISO 2108) |
| ISCCP | International Satellite Cloud Climatology Project |
| ISCII | Indian Standard Code For Information Interchange |
| ISDN | Integrated Services Digital Network |
| ISEF | Intel International Science And Engineering Fair |
| ISEN | Internet Search Environment Number |
| ISF | Internal Security Force |
| ISIS | Institute For Science And International Security |
| ISK | Icelandic Krona (ISO 4217 Currency Code) |
| ISL | Iceland (ISO 3166 Trigram) |
| ISL | Icelandic Language (ISO 639-2 Code) |
| ISLN | International Standard Lawyer Number |
| ISM | Industrial |
| ISMB | International Society Of Matrix Biologists |
| ISO | In Search Of -International Organization For Standardization (from The Greek ?†?? |
| ISP | International Standardized Profile - Internet Service Provider - Information Systems Professional |
| ISR | Intelligence |
| ISRO | Indian Space Research Organisation |
| ISS | International Shorebird Survey (North America) - International Space Station |
| ISSCR | International Society For Stem Cell Research |
| ISSN | International Standard Serial Number (ISO 3297) |
| IST | Information System Technology - UCF Institute For Simulation And Training |
| ISTAR | Intelligence |
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