| Abk. | Bedeutung | Kontext |
| I | Initiale | X.400-Adressierung |
| I | Strom | Physik |
| I | Italien | Autokennzeichen |
| I | private Investitionen | VWL |
| IAB | Internet Architecture Board | |
| IAC | Internet Application Components | SAP R/3 |
| IAF | Frauenhofer-Institut für angewandte Festkörperphysik | |
| IANA | Internet Control Message Protocol | |
| IAS | International Accounting Standards | |
| IBM | International Business Maschines | |
| IBIS | Integriertes Börsenhandels- und Informationssystem | Finanzmarkt |
| IBR | Image Based Rendering | Grafik |
| IC | Integrated Circuits, Integrierte Schaltung | |
| ICC | International Chamber of Commerce | |
| ICM | Intellectual Capital Management | IBM |
| ICP | Internet Content Provider | |
| ICPP | International Conference on Parallel Processing | |
| ICR | Intelligent Character Recognition | |
| ICS | Incremental Change Synchronization | |
| ID | Identity, Identifier, Identification oder Instruction Decode | |
| IDC | International Data Corporation | |
| IDE | Integrated Device Electronics | |
| IDEA | International Data Encryption Algorithm | |
| IDEF | I-CAM Definition Method No. 1 Extended | |
| i.d.F. | in der Fassung | |
| i.d.F.v. | in der Fassung vom | |
| IDIMT | Interdisciplinary Information Management Talks | Konferenz |
| IDOC | Intermediate Document | |
| i.d.R. | in der Regel | |
| IdW | Institut der Wirtschaftsprüfer | |
| IE | Internet Explorer | |
| i.e. | Id Est | |
| IEEE | Institute of Electrical and Electronics Engineers, Inc. | |
| i.e.S. | im engeren Sinne | |
| IEW | Information Engineering Workbench | KnowledgeWare Inc. |
| IETF | Internet Engineering Task Force | |
| IFIP | International Federation for Information Processing | |
| IFL | Integrated Fuse Logic | Elektrotechnik |
| IfW | Institut für Weltwirtschaftsforschung, Kiel | |
| IGES | Initial Graphics Exchange Specification | |
| IGMP | Internet Group Management Protocol | |
| IHG | Investitionshilfegesetz | |
| IHK | Industrie- und Handelskammer | |
| IIP | Internet Printing Protocol | |
| IIS | Internet Information Server | Microsoft |
| IKR | Industriekontenrahmen | |
| IKT | Informations- und Kommunikationstechnologie | |
| i.L. | in Liquidation | |
| Im | Importe | VWL |
| IMAP4 | Internet Message Access Protocol, Version 4 | |
| IMCEA | Internet Mail Connector Encapsulated Address | MS Exchange Server |
| IMP | Interface Message Processor | |
| IMS | Internet Mail Service | MS Exchange Server |
| IMS | Information Management System | IBM |
| In | Indium | Chemisches Element |
| InAs | Indiumarsenid | Halbleiter |
| incl. | inclusive | |
| INCO | International Champer of Commerce | |
| INGRES | Interactive Graphics and Retrieval System | |
| inkl. | inklusive | |
| INMAS | Interface Management System | |
| INS | Internet News Service | MS Exchange Server |
| InvZulG | Investitionszulagengesetz | |
| InSb | Indiumantimonid | Halbleiter |
| IO | Management Zeitschrift Industrielle Organisation | Zeitschrift |
| IOP | Input Output Processor, Ein-/Ausgabe Prozessor | |
| IP | Internet Protocol | |
| IPC | Interprocess Communicaion | |
| IPE | Institut für Physikalische Elektronik | |
| IPM | Interpersonal Message | X.400 |
| IPN | Interpersonal Notification | X.400 |
| IPPM | Integriertes Produktions-Prozessmodell) | |
| IPS | In Plane Switching | Grafik-Displays |
| IPX | Internetwork Packet Exchange | |
| IRC | Internet Relay Chat | |
| IRA | Irish Revolution Army | |
| IRTF | Internet Research Task Force | |
| IS | Informationsspeicher | MS Exchange |
| IS | Informationssystem | |
| ISA | Industry Standard Architecture | |
| ISAD | Information Society and Development | Konferenz |
| ISAM | Index Sequential Access Method | |
| ISDN | Integrated Services Digital Network | |
| ISE | Frauenhofer-Institut für Solare Energiesysteme | |
| ISESS | International Symposium on Environmental Software Systems | Konferenz |
| ISO | International Standards Organization | |
| ISOC | Internet Society | |
| ISP | Internet Service Provider | |
| ISS | Information System Study | |
| IT | Informationstechnologie | |
| ITS | Internet Transaction Server | SAP R/3 |
| ITU | International Telecomuunications Union | früher CCITT |
| ITWM | Institut für Techno- und Wirtschaftsmathematik | |
| IuKDB | Informations- und Kommunikationsdienste Gesetz | |
| IV | Informationsverarbeitung | Informatik |
| i.V.m. | in Verbindung mit | |
| IVS | Interactive Voice Response | Informatik |
| IWAN | International Working Conference on Active Networks | Konferenz |
| IWF | Internationaler Währungsfond | |
| IWO | Institut für Wirtschaftsforschung, Halle | |
| i.w.S. | im weiteren Sinne | |
| IWTCS | International Workshop on Testing of Communication Systems | Workshop |