HAIC (Index) – Hetero-Atom-in-Context (Index)
HDC – Hospital Data Center (Chicago)
HEPI – High Energy Physics Index (Hamburg)
HMSO – His/Her majesty’s Stationery Office
HR – Human Resources
HTML – HyperText Markup Language
HTTP – HyperText Transfer Protocol
HTTPS – Hyper Text Transfer Protocol Secure
IAALD – International Association of Agricultural Librarians and Documentalists (England)
IALL – International Association of Law Libraries
IAML – International Association of Music Libraries (Paris)
IAOL – International Association of Oriental Libraries
IASL – International Association of School Libraries
IATUL – International Association of Technical University Libraries
IB – Information Behavior
Ibid. – Ibidem (i.e., in the same place)
IBY – International Book Year
ICA – International Council of Archives
ICSSD – International Committee for Social Science Documentation (Paris)
ICSSR – Indian Council of Social Science Research
ICSU – International Council of Scientific Unions (Paris)
ICT – Information and Communication Technology
Id – Idem (i.e., the same author or publisher)
IDC – International Documentation Centre (Sweden)
IE – Internet Explorer
IEN – (Xerox) Information Exchange Network
IFD – International Federation for Documentation
IFIS – International Food Information Service
IIB – International Institute of Bibliography (renamed as FID)
III – Innovative Interfaces, Incorporated
IIT – Indian Institute of Technology
ILA – Indian Library Association
ILL – Inter Library loan
ILRC – Inter-Library Resource Centre (at ICSSR)
ILSA – Indian Library Science Abstracts (Quarterly)
IMC – International Micrographic Congress
IMCE – International Meeting of Cataloguing Experts (Copenhagen, 1969)
IMLS – Institute for Museum and Library Services
INB – Indian National Bibliography
INDAAL – Indian Association of Academic Librarians
INFOTERM – International Information Centre for Terminology (Vienna)
INICAE – International Information, Communication and Education (Journal published from Lucknow)
INPADOC – International Patent Documentation Centre (Vienna)
INSDOC – Indian National Scientific Documentation Centre (presently NISCAIR)
INSPEC – International Service in Physics, Electro-Technology, Computers; International Information Service for the Physics and Engineering Communities (UK)
INTIB – International Technological Information Bank
INTREX – Information Transfer Experiments (MIT, USA)
IOL – Institute of Librarians (Calcutta)
IPA – International Publishers Association
IPC – International Patents Classification
IR – Information Retrieval
IRANDOC – Iranian Documentation Centre (Teheran, 1968)
IRCIHE – International Referral Centre for Information handling Equipment (Yugoslavia)
ISA – Indian Standardisation Association; Information Science Abstracts (bi-monthly, USA)
ISBD (A) – International Standard Bibliographic Description (Antequarian)
ISBD (CM) – International Standard Bibliographic Description (Cartographic Material)
ISBD (CP) – International Standard Bibliographic Description (Component Parts)
ISBD (G) – International Standard Bibliographic Description (General)
ISBD (M) – International Standard Bibliographic Description (Monograph)
ISBD (NBM) – International Standard Bibliographic Description (Non-Book Material)
ISBD (S) – International Standard Bibliographic Description (Serials)
ISC – Information for Social Change (Advocacy group : United Kingdom)
ISCED – International Standard Classification of Education
ISDS – International Serials Data System
ISI – Indian Standard Institution (New Delhi); Institute for Scientific Information
ISO – International Organization for Standardisation
ISODOC – International Information Centre for Standards in Information and Documentation
ISP – Internet Service Provider
ISR – Index to Scientific Reviews; Information Storage and Retrieval
ISSN – International Standard Serial Number
ISTA – Indian Scientific Translators’ Association (Delhi)
IT – Information Technology
ITC – International Translation Centre (Netherlands)
IYL – International Youth Library
JAKE – Jointly Administered Knowledge Environment
JISTA – Journal of Indian Scientific Translators’ Association (ISTA)
JLA – Japan Library Association
JPEG – Joint Photographic Experts Group
JSTOR – Journal STORage
KC – Kyle Classification
KLIC – Key Letter in Context
KWAC – Key Word And Context; Key Word Augmented in Context
KWIC – Key Word In Context
KWIT – Key Words In Title
KWOC – Key Word Out of Context
KWOT – Key Words Out of Title
