Abréviations en informatique I
i18n : internationalisation (de logiciel)
 x86 : Intel Corporation Architecture x86 microprocessor Familly
 IA-32 : Intel Corporation Architecture 32-bit microprocessor
 IA-64 : Intel Corporation Architecture 64-bit microprocessor
 IANA : Internet Assigned Numbers Authority
 IAS
 Internet Authentication Service
 Internet Application Server
 IBM : International Business Machines
 ICA : Independent Computing Architecture de Citrix Presentation Server
 ICF : 
 ICANN : Internet Corporation for Assigned Names and Numbers
 ICMP : Internet Control Message Protocol
 ICSA : International Computer Security Association (anciennement NCSA)
 ICT :  Information and Communications Technology
 IDA : Interactive DisAssembler
 IDE
 Integrated Drive Electronics
  Integrated Development Environment
 IDL : Interface Description Langage
 IDS :  Intrus Logic-ion Détection System
 IDP : Internet Datagram Protocol
 IDPR ; Inter-Domain Policy Routing Protocol
 IDRP : Inter-Domain Routing Protocol
 IE : Internet Explorer
 IEEE : Institute of Electrical and Electronics Engineers
 IETF : Internet Engineering Task Force
 IFD : InterFace Device, Smartcard
 IFS
 Internal Field Separator
  : Sur les premières versions de Windows NT
 IGMP : Interior Gateway Routing Protocol
 IGP : Interior gateway protocol
 IIP
 Internet Imaging Protocol
 Invisible IRC Project
 IIS : Internet Information Services
 IM :  Instant Messenger
 IMAP : internet Message Access Protocol
 IMO/IMHO : In My (Humble) Opinion, à mon humble avis
 IMS :  Information Management System
 IMUSE : Interactive Music Streaming Engine
 initrd : INIT RamDisk
 inode : Index Node
 I/O : Input/Output (Entrée/Sortie), voir aussi E/S
 IOAT : Intel I/O Acceleration Technology
 IOCTL : I/O ConTroL, voir Ioctl
 IOS :  Internetwork Operating System
 IP : Internet Protocol
 IPC :  Inter-Process Communication
 IPCOMP : IP Payload COMpression Protocol
 IPENCAP : IP ENCapsulated in IP
 IPL : Initial Program Load
 IPP : Internet Printing Protocol
 IPsec : Internet Protocol Security
 IPX : Internetwork packet exchange
 IR : InfraRed
 IrDA :  Infrared Data Association
 IRC : Internet Relay Chat
 IRP :  I/O Request Packet
 IRQ :  Interrupt ReQuest
 IRQL : IRQ Level
 ISA
 Industry Standard Architecture (bus ISA))
 Instruction Set Architecture
 ISAKMP : Internet Security Associations and Key Management Protocol
 ISDN :  Integrated Services Digital Network
 IS-IS :  Intermediate system to intermediate system
 ISP : Internet Service Provider (Fournisseur d'accès à Internet) 
 ISR : Interrupt Service Routine, In-Sync Replicas
 ISV : Independent Software Vendor, voir Éditeur de logiciel
 IT : Information Technology, Informatique
 ITIL :  Information Technology Infrastructure Library
 ITK : Insight ToolKit

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