| i | Isoleucine (amino acid) |
| i. e. S. | im engeren Sinne |
| i. Li. | im Lichten(inside dimension) |
| i. L. | in Liquidation |
| i. d. f. v. | in der Fassung von |
| i. d. R. | in der Regel |
| IAA | 3-beta-indoleacrylic acid |
| IAA | Indole-3-acetic acid |
| IAEA | International Atomic Energy Agency |
| IAETL | International Association of Environmental Testing Laboratories |
| IAG | Inspection Action Group (UK, pharmaceuticals) |
| IAGI | Internal Association of Geosynthetic Installers |
| IAHA | Immune Adherence HemAgglutination |
| IAMPO | International Association of Plumbing and Mechanical Officials |
| IAS | Institute of Aeronautical Sciences (later AIAA) |
| IAS | International accounting standard |
| IATA | International Air Transport Association |
| IBR | Hydrogen cyanide, arsenic trichloride, chloroform(Eng. WWI Chem. Agt.) |
| IC | InterCity German national express train; up to 200 kph |
| ICAAC | Interscience Conference on Antimicrobial Agents and Chemotherapy |
| ICAO | International Civil Aviation Organization |
| ICAP | Inductively Coupled Argon Plasma |
| ICBO | International Congress of Building Officials |
| ICC | (US) Interstate Commerce Commission |
| ICC | International Code Council |
| ICD-9-CM | International Classification of Diseases, 9th Rev., Clinical Modification |
| ICDD | International Center for Diffraction Data |
| ICE | (German)(Eur.) InterCity Express up to 250 kph |
| ICH | International Conference on Harmonization (pharm. regulation) |
| ICH | International Conference on Harmonization(of pharmacopeias) |
| ICI | Imperial Chemical Industries (Britain, company) |
| ICM | Improved conventional munition |
| ICMP | Internet Control Message Protocol |
| ICN | InterCity Night German national night train operated by TALGO |
| ICP | Intracranial pressure |
| ICP-MS | Inductively Coupled Plasma - Mass Spectrometry |
| ICPAE | Inductively Coupled Plasma Atomic Emission |
| ICPIP | International Convention for the Protection of Intellectual (?) Property |
| ICPMS | Inductively Coupled Plasma Mass Spectrometry |
| ICR | Ion Cyclotron Resonance |
| ID | Inside Diameter |
| ID | Identification |
| IDDM | Insulin-dependent Diabetes mellitus |
| IDLH | Immediately Dangerous to Life or Health |
| IDSA | Infectious Disease Society of America |
| IDSEP | Improved dual-shaft electric propulsion |
| IEC | International Electrotechnical Commission |
| IEEE | Institute of Electrical and Electronic Engineers |
| IEF | Isoelectric focusing |
| IES | Illuminating (Illumination ?) Engineering Society |
| IEX | Ion exchange |
| IF | ImmunoFluorescence |
| IFAG | Institut für angewandte Geodäsie |
| IFCC | International Federation of Clinical Chemistry |
| IFD | Immunofluorescence direct (= DIF) |
| IFN | Interferon |
| IFPMA | International Federation of Pharmaceutical Manufacturers Associates |
| IFSCC | International Federation of Societties of Cosmetic Chemists |
| IFT | Institute of Food Technologists |
| Ig | Immunoglobulin |
| IG | Inspector General |
| IGF | Insulin-like growth factor |
| IGMP | Internet Group Management Protocol |
| IH | Inhibition de l'hémagglutination |
| IHA | Inhibition of hemagglutination |
| IHK | Industrie- und Handelskammer |
| IHSS | Idiopathic hypertrophic subaortic stenosis |
| IITRI | Illinois Institute of Technology Research Institute |
| ILAC | International Laboratory Accreditation Conference |
| Ile | Isoleucine |
| ILO | International Labor Office |
| ILR | Institut für Landesplanung und Raumforschung (Univ. Hannover) |
| ILS | Instrument landing system |
| IM | IntraMuscular |
| IM/DD | Intensity Modulation/Direct Detection |
| IMBC | International Marine Biotechnology Conference |
| iMBC | Minimum bactericidal concentration |
| IMDG | International Maritime Dangerous Goods (Code) |
| IME | Institute of Makers of Explosives |
| IMEC | Interuniversity Microelectronics Center (Leuven, Belgium) |
| IMO | International Maritime Organization |
| IMPDH | Inosine monophosphate dehydrogenase |
| IMR | Improved Military Rifle (trade name of smokeless powder; do not translate) |
| IMS | Industrial Methylated Spirit (Methanol) |
| INCB | International Narcotics Control Board (United Nations) |
| IND | Investigative (Investigational?) New Drug (US FDA) |
| IND | Investigative New Drug |
| INH | Isoniazid(isonicotinic acid hydrazide) |
| INN | International Nonproprietary Name(Pharmaceutical) (generic name) |
| IOC | International Olympic Committee |
| IOM | Institute of Medicine |
| IOP | Intraocular pressure |
| IP | IntraPeritoneal |
| IP | Internet Protocol |
| IPA | Isophthalic acid |
| IPA | Isopropyl alcohol |
| IPCC | (UN) Intergovernmental Panel on Climate Change |
| IPEC | International Pharmaceutical Excipients Council |
| IPNC | N-isopropylcarbamoyl |
| IPO | Initial Public Offering (of corporate stocks) |
| IPOC | Isopropoxycarbonyl |
| IPPB | Intermittent Positive Pressure Breathing |
| IPTG | Isopropyl beta-D-thiogalactopyranoside |
| IPTG | Isopropylthiogalactoside |
| IR | Infrared (often spectrometry) |
| IR | InterRegioEuropean express train between local cities |
| IR-[number] | One of a series of infrared laser dyes |
| IRFNA | Inhibited Red Fuming Nitric Acid |
| IRWC | Institute of Roofing and Waterproofing Consultants |
| ISDN | Integrated Services Digital Network (telephone system) |
| ISE | Ion-Selective Electrode (chemical analysis) |
| ISO | International organization for standardization |
| ISP | Internet Service Provider |
| ISRF | Internal Standard Response Factor |
| ISRT | in situ reverse transcription |
| ISU | International Shooting Union |
| IT | Information Technology |
| ITB | Invitation to Bid |
| ITC | Independent Television Companies (UK) |
| ITD | Ion Trap Detection |
| ITRD | Innovative Treatment Remediation Demonstration (US DOE) |
| ITRS | International Technology Raodmap for Semiconductors |
| ITT | Insulin Tolerance Test |
| ITU | International Telecommunications Union |
| IUB | International Union of Biochemistry |
| IUGR | IntraUterine Growth Retardation |
| IUPAC | International Union of Pure and Applied Chemistry |
| IV | IntraVenous |
| IVC | IntraVenous Cholangiogram |
| IVP | IntraVenous Pyelography |
| IWFNA | Inhibited White Fuming Nitric Acid |
| IWS | Institut für Wassergefährdendende Stoffe |
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