This list contains acronyms, initialisms, and pseudo-blends that begin with the letter I.
For the purposes of this list:
- acronym = an abbreviation pronounced as if it were a word, e.g., SARS = severe acute respiratory syndrome, pronounced to rhyme with cars
 - initialism = an abbreviation pronounced wholly or partly using the names of its constituent letters, e.g., CD = compact disc, pronounced cee dee
 - pseudo-blend = an abbreviation whose extra or omitted letters mean that it cannot stand as a true acronym, initialism, or portmanteau (a word formed by combining two or more words).
 
- (a) = acronym, e.g.: SARS – (a) severe acute respiratory syndrome
 - (i) = initialism, e.g.: CD – (i) compact disc
 - (p) = pseudo-blend, e.g.: UNIFEM – (p) United Nations Development Fund for Women
 - (s) = symbol (none of the above, representing and pronounced as something else; for example: MHz – megahertz)
 
Some terms are spoken as either acronym or initialism, e.g., VoIP, pronounced both as voyp and V-O-I-P.
I0–9
- I2WD or I2WD – (i) U.S. Intelligence and Information Warfare Directorate (CERDEC)
 
IA
- ia – (s) Interlingua language (ISO 639-1 code)
 - IA – (s) Iowa (postal symbol)
 - IAAF – (i) International Association of Athletics Federations ("International Amateur Athletics Federation" from 1912 to 2001; renamed "World Athletics" in 2019)
 - IAAL – (i) I Am A Lawyer
 - IAAS - (p) Infrastructure-as-a-Service
 - IAB – 
- (i) International Association for Biologicals
 - IATA code of McConnell Air Force Base
 
 - IACREOT – (i) International Association of Clerks, Recorders, Election Officials, and Treasurers
 - IAD – 
- (i) Ion Assisted Deposition
 - IATA code for Washington Dulles International Airport
 
 - IADS – (i) Integrated Air Defence System
 - IAE - (i) International Aero Engines (aircraft engine joint venture)
 - IAEA – (i) International Atomic Energy Agency
 - IAF
- {i} Industrial Areas Foundation
 - (i) Israeli Air Force
 
 - IAFG – (i) Information Assurance Focus Group
 - IAI –
 - IANA – (i) Internet Assigned Numbers Authority
 - IANAL – (i) I Am Not A Lawyer
 - IAPD
- International Associates of Paediatric(sic) Dentistry
 - (i) Investment Adviser Public Disclosure
 - iShares Asia Pacific Dividend
 
 - IAQ – (i) Indoor air quality – Infrequently Asked Questions
 - IAS – (i) Image Assessment System
 - IASIP – (i) It's Always Sunny in Philadelphia
 - IATA – (a/i) International Air Transport Association
 - IATF – International Automotive Task Force
 - IATSE – International Alliance of Theatrical Stage Employees
 - IAU – (i) International Association of Universities – International Astronomical Union
 - IAUC – (i) International Astronomical Union Circular
 - IAW – (i) In Accordance With
 
IB
- IB – (i) International Baccalaureate
 - IBA – (i) Important Bird Area
 - IBD – (i) Inflammatory Bowel Disease
 - IBDM – (i) Information Based Decision Making
 - IBDS – (i) Integrated Biological Detection System – International Business Development Specialist
 - IBF - International Boxing Federation
 - IBGe – (i) Isobutylgermane
 - IBGE – (i) Instituto Brasileiro de Geografia e Estatística (Portuguese, "Brazilian Institute of Geography and Statistics")
 - IBHOF - International Boxing Hall of Fame
 - IBM – (i) International Business Machines
 - ibo – (s) Igbo language (ISO 639-2 code)
 - IBRD – (i) International Bank for Reconstruction and Development (part of the World Bank)
 - IBS – (i) Irritable Bowel Syndrome
 
IC
- IC
- (s) Ice Crystals (METAR Code)
 - Iceland (FIPS 10-4 country code)
 - (i) Integrated Circuit - [inner circle]
 
 - ICANN – (a) Internet Corporation for Assigned Names and Numbers
 - ICAO – (i) International Civil Aviation Organization
 - ICBM – (i) Intercontinental Ballistic Missile
 - ICBM – I see (phonetically "c") BatMan
 - ICBN – (i) International Code of Botanical Nomenclature
 - ICC
- (i) Integrated Command and Control
 - International Criminal Court
 - International Cricket Council
 - Interstate Commerce Commission
 - International Chamber of Commerce
 
 - ICD
- (i) Implantable Cardioverter-Defibrillator
 - Initial Capabilities Document
 - International Classification of Diseases
 
 - ICE
- (i/a) (U.S.) Immigration and Customs Enforcement
 - In case of emergency
 - Internal Combustion Engine (Vehicles)
 
 - ICES – (a/i) International Council for the Exploration of the Sea
 - ICF – (i) Intelligent Community Forum
 - ICHTHYS – (a) Iesous Christos, Theou Yios, Soter (Greek, "Jesus Christ, Son of God, Savior")
 - ICM
- (i) Improved Conventional Munition
 - Integrated Collection Management
 - International Congress of Mathematicians
 - Iraq Campaign Medal
 
 - ICMP – (i) Internet Control Message Protocol
 - ICNAF – (i) International Commission for the Northwest Atlantic Fisheries (became NAFO in 1978)
 - ICNI – (i) Integrated Communication, Navigation, and Identification
 - ICO – (i) Intermediate Circular Orbit
 - ICP
 - ICPE – (a/i) International Conference on Pharmacoepidemiology, the annual conference of the International Society for Pharmacoepidemiology
 - ICRAF – (i) International Centre for Research in Agroforestry (a.k.a. World Agroforestry Centre since 2002)
 - ICRISAT – (i/a) International Crops Research Institute for the Semi-Arid Tropics
 - ICRL – (i) Individual Component Repair List
 - ICRS – (i) International Celestial Reference System
 - ICS
- (i) In-Country Support
 - Intelligence and Communications Systems
 - Interim Contractor Support
 
 - ICSI – (p) Intracytoplasmic Sperm Injection
 - ICT – (i) Information and communication technologies
 - ICTH – (i) Island Closest to Heaven/Hell Final Fantasy VIII
 - ICV – (i) Infantry Carrier Vehicle
 - ICW
- (i) In Co-ordination With
 - Indonesia Corruption Watch
 - Infectious and Chemotherapeutic Waste
 - Insulating Concrete Wall
 - Integral Crystalline Waterproofing
 - (p) Interactive Courseware
 - (i) International Championship Wrestling (defunct US professional wrestling promotion)
 
 - ICYMI – (i) In Case You Missed It
 - ICZN
 
ID
- id – (s) Indonesian language (ISO 639-1 code)
 - ID
- (s) Idaho (postal symbol)
 - (p) Identity
 - (s) Indonesia (FIPS 10-4 country code; ISO 3166 digram)
 - (i) Infantry Division
 - Intelligent Design
 
 - ID10T Error – (i) Idiot User Error (IT help desk inside joke)
 - IDA
- (i) U.S. Institute for Defense Analyses
 - International Development Association (part of the World Bank
 
 - IDC – (i) International Data Corporation
 - IDDI – (i) I don't do initialisms (see irony)
 - IDE
 - IDeA – (a) Improvement and Development Agency, the former name of Local Government Improvement and Development in the United Kingdom
 - IDEA
 - IDF
- (i) Israel Defense Forces
 - Intel Development Forum
 - International Dairy Federation
 
 - IDGAF – (i) I don't give a f**k
 - IDK – (i) I don't know
 - IDKIBTI – I don't know, I'm black, that's it
 - IDL – (i) Interface Definition Language
 - IDN – (s) Indonesia (ISO 3166 trigram)
 - ido – (s) Ido language (ISO 639-2 code)
 - IDR – (s) Indonesian rupiah (ISO 4217 currency code)
 - IDTS – (i) I don't think so
 
IE
- i.e. – (i) id est (Latin, roughly "that is")
 - ie – (s) Interlingue language (ISO 639-1 code)
 - IE – (i) Indo-European languages – Internet Explorer – (s) Ireland (ISO 3166 digram) – Iced Earth
 - IEA – (i) International Energy Agency
 - IEC – (i) International Electrotechnical Commission
 - IED – (i) Improvised Explosive Device
 - IEEE – (p) Institute of Electrical and Electronics Engineers ("I triple-E")
 - IELTS – (a) International English Language Testing System
 - IER – (i) Information Exchange Requirement
 - IET – (i) Institution of Engineering and Technology
 - IET – (ii) Initial Entry Training
 - IETF – (i) Internet Engineering Task Force
 - IEW – (i) Intelligence and Electronic Warfare
 
IF
- IFAB – (i) International Football Association Board
 - IFAH – (i) International Federation for Animal Health
 - IFAP – (i) International Federation of Agricultural Producers, (i) International Fashion Academy Pakistan
 - IFC – (i) International Finance Corporation (part of the World Bank) – (a) Independent Film Channel
 - IFF – (i) Identification, Friend or Foe – Individually Fresh Frozen – International Flavors and Fragrances
 - IFFN – (i) Identification, Friend, Foe, or Neutral
 - IFO – (i) Identified Flying Object (see also UFO)
 - IFOR – (p) UN Implementation Force – (i) Institute for Operations Research – International Fellowship of Reconciliation
 - IFOV – (i) Instantaneous Field of View
 - IFPI – (i) International Federation of Phonographic Industries
 - IFR – (i) Instrument Flight Rules
 - IFRB – (i) International Frequency Registration Board
 - IFV – (i) Infantry Fighting Vehicle
 
IG
- ig – (s) Igbo language (ISO 639-1 code)
 - IG – 
- (i) Inspector General
 
 - IGFA – International Game Fish Association
 - IGM - IATA code for Kingman Airport
 - IGNOU – (a) Indira Gandhi National Open University
 - IGS – (i) International Ground Station
 - IGY – (i) Israeli Gay Youth – International Geophysical Year
 
IH
- IHÉS – (i) Institut des Hautes Études Scientifiques (French, Institute of Advanced Scientific Studies)
 - IHH – (i) Idiopathic Hypogonadotropic Hypogonadism
 - IHO – (i/a) International Hydrographic Organization
 - IHOP – (i/a) International House of Pancakes, the original name of this American restaurant chain ("EYE-hop")
 - IHR – (i) Institute for Historical Review
 - IHSI – Institutum Historicum Societatis Iesu (Jesuit Historical Institute)
 
II
- ii – (s) Sichuan Yi language (ISO 639-1 code)
 - II – (s) Two (in Roman numerals)
 - IICA – (i) Inter-American Institute for Cooperation on Agriculture
 - IIE – (i) Innovative Interstellar Explorer
 - iii – (s) Sichuan Yi language (ISO 639-2 code)
 - III – (s) Three (in Roman numerals)
 - IIMSS – If I May Say So
 - IIRC – If I Remember Correctly, If I Recall Correctly
 - IISS – (i) International Institute for Strategic Studies
 - IIT – (i) Illinois Institute of Technology – Indian Institutes of Technology – Indiana Institute of Technology
 - IITM – (i) Image Institute of Technology & Management – Indian Institute of Technology Madras – Indian Institute of Tropical Meteorology
 - I/ITSEC – (a) Interservice/Industry Training, Simulation and Education Conference ("eye-it-sec" or "it-sec")
 
IJ
- IJN – (i) Imperial Japanese Navy (World War II)
 - IJWP – (i) Interim Joint Warfare Publication
 
IK
- ik – (s) Inupiaq language (ISO 639-1 code)
 - IKEA – (a) Ingvar Kamprad (the company's founder), Elmtaryd (the farm where he was born and raised), Agunnaryd (a village and parish near the farm)
 - iku – (s) (s) Inuktitut language (ISO 639-2 code)
 
IM
- IM
- (s) Isle of Man (FIPS 10-4 territory code)
 - (i) Instant Message (Internet speech)
 
 - IMA
- (i) Intermediate Maintenance Activity
 - Institute of Mathematics and Applications
 
 - IMBD – (i) International Migratory Bird Day
 - IMDb – Internet Movie Database
 - IME - (i) In My Experience
 - IMF
- (i) id music file/id's music format (audio file format)
 - Impossible Missions Force, the protagonist organization in the Mission: Impossible media franchise
 - International Monetary Fund (the most common use for the initialism)
 
 - IMHO – (i) In My Humble/Honest Opinion, cf. IMO
 - IMIST AMBO – used to facilitate an informed clinical handover between paramedics, emergency department staff or other healthcare[1][2][3][4][5] similar to SBAR:[1] Identification, Method of Injury, Index of concern, Signs, Treatment, Allergies, Medication, Background, and Other
 - IML – (i) International Mister Leather
 - IMLAST – (i) International Movement for Leisure Activities in Science and Technology – see MILSET
 - IMNM - (i) - Immune-mediated necrotizing myopathy a rare, but serious ADR of statins
 - IMNSHO – (i) In My Not So Humble Opinion
 - IMO (in my opinion) – (i) In My Opinion, also "imo", cf. IMHO
 - IMPAC – (a) International Merchant Purchase Authorization Card
 - IMPACT – (a) International Medical Products Anti-Counterfeiting Taskforce
 - IMPATT – (p) IMPact Avalanche Transit Time diode
 - IMPT – (i) Institute of Maxillofacial Prosthetists and Technologists
 - IMR – (i) Inzhenernaya Mashina Razgrazhdeniya (Russian Инженерные Машины Разграждения, "Engineer Vehicle Obstacle-Clearing") †
 - IMRI
- (i) Industrial Membrane Research Institute
 - Information Management Research Institute
 - Institut pour le management de la recherche et de l'innovation (French, "Institute for the Management of Research and Innovation")
 - International Market Research Information
 - Intraoperative Magnetic Resonance Imaging
 
 - IMRO
 - IMRL – (i) Individual Material Readiness List
 - IMS
- (i) Information Management System
 - International Meat Secretariat
 - Ion Mobility Spectrometer
 
 - IMSA
 - IMsL – (a) International Ms. Leather
 - IMT – (i) Integrated Management Tool
 - IMU – (i) International Mathematical Union
 
IN
- In – (s) Indium
 - IN – (s) India (FIPS 10-4 country code; ISO 3166 digram) – Indiana (postal symbol) – Infantry
 - ina – (s) Interlingua language (ISO 639-2 code)
 - INA – (p) Immigration and Nationality Act
 - INAS – (a) International Near-Earth Asteroid Survey
 - INC – (i) Indian National Congress, one of the national political parties in India
- (i) Iglesia ni Cristo (Filipino, "Church of Christ")
 - Indian National Congress
 - International Network of Crackers
 - Iraqi National Congress
 
 - INCITS – (p) InterNational Committee for Information Technology Standards
 - ind – (s) Indonesian language (ISO 639-2 code)
 - IND – (s) India (ISO 3166 trigram)
 - inet – (a) the Internet
 - INDIGO – (p) (U.S.) INtelligence DIvision Gaming Operation
 - INFORMS – (a) (U.S.) Institute for Operations Research and the Management Sciences
 - INFOSEC – (p) Information Security
 - INLA – (i) Irish National Liberation Army
 - INMARSAT – (p) International Maritime Satellite organization
 - INR – (s) Indian rupee (ISO 4217 currency code)
 - INRI – (a/i) Iesus Nazarenus Rex Iudæorum (Latin, "Jesus of Nazareth, King of the Jews")
 - INRIA – (p) Institut national de recherche en informatique et en automatique
 - INS – (i) Immigration and Naturalization Service
 - InSAR – (p) Interferometric synthetic aperture radar
 - INST – (p) Information Standards and Technology
 - in trans. – (p) in transitu (Latin, "in transit")
 - INTSUM – (p) Intelligence Summary
 - INTERFET – (p) International Force for East Timor
 
IO
- io – (s) Ido language (ISO 639-1 code)
 - IO – (s) British Indian Ocean Territory (ISO 3166 digram; FIPS 10-4 territory code)
 - IOC
- (i) Initial Operational Capability
 - Intergovernmental Oceanic Commission
 - International Olympic Committee
 - International Ornithological Congress
 
 - IOG (formerly IOHK) – Input Output Global. Redirected to Charles Hoskinson
 - IOHK – Input Output Hong Kong. Redirected to Charles Hoskinson
 - IOLTA – (a) Interest on Lawyer Trust Accounts (charitable funding mechanism, especially for legal aid)
 - IOM
- (i) Iowa, Ohio, Michigan (soybean origin)
 - Institute of Medicine
 - International Organisation for Migration
 - Isle of Man
 
 - IONA – (i) Islands of the North Atlantic (alternate name for Great Britain, Ireland, the Isle of Man, and related islands)
 - IoT - (i) Internet of Things
 - IOT – (s) British Indian Ocean Territory (ISO 3166 trigram)
 - IOT&E – (i) Initial Operational Test and Evaluation
 - IOU – (p) "I Owe You" (Promissory note)
 
IP
- IP – 
- (s) Clipperton Island (FIPS 10-4 territory code)
 - (i) Initial Point – Intellectual Property – Internet Protocol
 
 - IPA – (i) India Pale Ale – International Phonetic Alphabet – Isopropyl alcohol
 - IPB – (i) Intelligence Preparation of the Battlefield
 - IPCC –
 - ipk – (s) Inupiaq language (ISO 639-2 code)
 - IPL – (i) Inferior Parietal Lobule
 - IPN – (i) Instytut Pamieci Narodowej (Polish, "Institute for National Memory")
 - IPO – (i) Initial public offering
 - IPR –
- (i) In Progress Review
 - Intellectual Property Rights
 - Intelligence Production Requirement
 
 - IPT – (i) Integrated Product/Project Team
 - IPTS – (i) Institute for Prospective Technological Studies
 - IPTV – (p) Internet Protocol TeleVision
 - IPW – (i) Interrogation of Prisoners of War
 
IQ
IR
- Ir – (s) Iridium
 - IR
- (i) Infrared
 - Intelligence requirement (military)
 - (s) Iran (FIPS 10-4 country code; ISO 3166 digram)
 - Iran Air (IATA alpha code) see entry for more
 
 - IRA
- (i) Individual retirement account
 - (i) Irish Republican Army (any of several armed groups dedicated to Irish republicanism)
 - Internet Research Agency (used in the Mueller report)
 
 - IRAD – (a) Internal Research and Development
 - IRAN - (I) Inspect and Repair As Necessary
 - IRAS – (p) Infrared Astronomical Satellite
 - IRB – (i) International Rugby Board, a former name of World Rugby
 - IRBM – (i) Intermediate Range Ballistic Missile
 - IRC
 - IREA
- (i) Intermountain Rural Electric Association
 - (i) International Renewable Energy Alliance
 - (p) Iranian Esperanto Association
 - (i) Internet Radio Equality Act
 
 - IRGC - (i) Islamic Revolutionary Guard Corps (branch of Iranian Armed Forces
 - IRL
- (s) Ireland (ISO 3166 trigram)
 - Industrial Research Limited
 - Indy Racing League, former name of the motorsport governing body now known as INDYCAR
 - (i) In real life
 
 - IRM
- (i) Illinois Railway Museum
 - Inzhenernaya Razvedyvatelnaya Mashina (Russian Инженерная Разведывательная Машина, "Engineer Reconnaissance Vehicle") †
 
 - IRN – (s) Iran (ISO 3166 trigram)
 - IRIAF - Islamic Republic of Iran Air Force
 - IRINN - Islamic Republic of Iran News Network
 - IRO – (i) International Refugee Organisation
 - IRQ – (s) Iraq (ISO 3166 trigram)
 - IRR – (s) Iranian rial (ISO 4217 currency code)
 - IRS – (i) U.S. Internal Revenue Service
 - IRSN – (i) Institut de radioprotection et de sûreté nucléaire (French, "Institute for Radiation Protection and Nuclear Safety")
 - IRST – (i) Infra-red Search and Track
 
IS
- is – (s) Icelandic language (ISO 639-1 code)
 - IS
 - ISA
 - ISAAA – (i) International Service for the Acquisition of Agri-biotech Applications
 - ISAF
 - ISAR – (a) Inverse SAR (Synthetic Aperture Radar)
 - ISB – (i) Intermediate Staging Base
 - ISBN – (i) International Standard Book Number (ISO 2108)
 - ISCCP – (i) International Satellite Cloud Climatology Project
 - ISCII – (a) Indian Standard Code for Information Interchange
 - ISDN – Integrated Services Digital Network
 - ISEF – (a) Intel International Science and Engineering Fair
 - ISEN – (i) Internet Search Environment Number
 - ISF – (i) Internal Security Force
 - ISI
- Indian Standards Institute, former name of the Bureau of Indian Standards
 - Inter-Services Intelligence (Pakistan)
 - Islamic State of Iraq, an umbrella organization for several Iraqi insurgent groups
 
 - ISIL – (i/a) Islamic State of Iraq and the Levant
 - ISIS
 - ISK – (s) Icelandic krona (ISO 4217 currency code)
 - isl – (s) Icelandic language (ISO 639-2 code)
 - ISL – (s) Iceland (ISO 3166 trigram)
 - ISLN – 
- (i) International Standard Lawyer Number (used initially by LexisNexis Martindale-Hubbell)
 - (i) International School Libraries Network (HQ in Singapore)
 - (s) Isilon Systems, the NASDAQ symbol
 
 - ISM
- (i) Industrial, scientific or medical
 - (p) Interstellar medium
 
 - ISMB – (i) International Society of Matrix Biologists
 - ISMC – (i) Intelligent Sounding Meaningless Conversation
 - ISO
- (i) In Search Of
 - (s) International Organization for Standardization (from the Greek ίσος, isos, meaning "equal")
 
 - ISOGP – (i) Indian Society of Orthodontics for General Practitioners
 - ISP
- (i) International Standardized Profile
 - Internet Service Provider
 - Information Systems Professional
 
 - ISPE – (a/i) International Society for Pharmacoepidemiology
 - ISR
- (i) Intelligence, Surveillance and Reconnaissance
 - (s) Israel (ISO 3166 trigram)
 
 - ISRO – (i) Indian Space Research Organisation
 - ISS
- (i) International Shorebird Survey (North America)
 - International Space Station
 
 - ISSCR – (i) International Society for Stem Cell Research
 - ISSN – (i) International standard serial number (ISO 3297)
 - IST
- (i) Information System Technology
 - UCF Institute for Simulation and Training
 
 - ISTAR – (i) Intelligence, Surveillance, Target Acquisition, and Reconnaissance
 - ISTC – (i) Institute of Scientific and Technical Communications (UK)
 - ISTG – (i) I Swear To God
 - ISTS – (i) Intel Science Talent Search
 - ISU
- (i) Integrated Sight Unit
 - International Skating Union
 
 
IT
- it – (s) Italian language (ISO 639-1 code)
 - IT
- (i) InferoTemporal (neurophysiology)
 - Information Technology
 - (s) Italy (FIPS 10-4 country code; ISO 3166 digram)
 
 - ita – (s) Italian language (ISO 639-2 code)
 - ITA – (s) Italy (ISO 3166 trigram)
 - ITAG – (i) Inertial Terrain-Aided Guidance
 - ITALY – (a) I'll Truly Always Love You
 - ITAS – (i) Improved Target Acquisition Sight
 - ITC
- (i) Incorporated Television Company (defunct British television production company)
 - InferoTemporal Cortex (neurophysiology)
 
 - ITCZ – (i/p) Intertropical Convergence Zone
 - ITEC – (a) Information Technology Exposition & Conference
 - ITEMS – (a) Interactive Tactical Environment Management System
 - ITER – (a) International Thermonuclear Experimental Reactor
 - ITF – (a) International Tennis Federation
 - ITK – (a) In The Know
 - ITN – (i) Independent Television News (British)
 - ITS
- (i) Incompatible Time-sharing System
 - Individual Training Standards
 
 - ITT – (i) International Telephone and Telegraph (U.S.)
 - ITTO – (i) International Tropical Timber Organization
 - ITU
- (i) Intent-to-Use
 - International Telecommunication Union (International Telegraph Union 1865–1932)
 
 
IU
- iu – (s) (s) Inuktitut language (ISO 639-1 code)
 - IUCN – (i) International Union for the Conservation of Nature and Natural Resources (World Conservation Union)
 - IUD – (i) Intrauterine device (https://www.plannedparenthood.org/learn/birth-control/iud)
 - IUI
- (i) Indiana University Indianapolis, to be established in 2024 upon the dissolution of Indiana University–Purdue University Indianapolis (IUPUI, below)
 - Intrauterine insemination (http://americanpregnancy.org/infertility/intrauterine-insemination/)
 
 - IUPAC – (a) International Union of Pure and Applied Chemistry (pronounced "eye-yoo-pac")
 - IUPUI – (a) Indiana University–Purdue University Indianapolis
 - IUSS
- (i) Integrated Undersea Surveillance System
 - Integrated Unit Simulation System
 - International Union of Soil Sciences
 
 
IV
- IV – (s) Côte d'Ivoire (FIPS 10-4 country code; from Ivory Coast) – Four (in Roman numerals) – (i) IntraVenous (as in intravenous drip or intravenous therapy)
 - IVD – (i) Internet Video Device, intra vas device
 - Iveco – (p) Industrial Vehicles Corporation
 - IVF – (i) In Vitro Fertilisation
 - IVI – (i) Interchangeable Virtual Instrument
 - IVIS – (i/a) Inter-Vehicle Information System
 - IVL – (i) Inter-Visibility Line
 - IVM – (i) In Vitro [Oocyte] Maturation
 - IVO – (i) In Vicinity Of
 
IW
- IW – (i) Impact Wrestling
 - IW – (i) Information Warfare
 - IWARS – (p) Infantry Warrior Simulation
 - IWC – (i) International Whaling Commission
 - IWT – (i) Illegal Wildlife Trade
 - IWW – (i) Industrial Workers of the World
 
IX
IY
- IY – (s) Saudi–Iraqi neutral zone (FIPS 10-4 territory code; obsolete 1993)
 - Iykyk (acronym) – (i) If You Know You Know
 
IZ
References
- 1 2 "Clinical handover between paramedics and emergency department staff: SBAR and IMIST-AMBO acronyms". ResearchGate. Retrieved 2021-05-04.
 - ↑ "Clinical Procedures and Guidelines: Comprehensive Edition" (PDF). Wellington Free Ambulance. 2019. Retrieved 2021-05-04.
 - ↑ "Clinical Procedures and Guidelines: Comprehensive Edition" (PDF). St John. 2016. Retrieved 2021-05-04.
 - ↑ "Clinical Practice Protocols - First Responders" (PDF). Ambulance Victoria. November 2019. Retrieved 2021-05-04.
 - ↑ Fulde, Gordian W. O.; Fulde, Sascha (2020-07-24). Emergency Medicine: The Principles of Practice. Elsevier Health Sciences. p. 68. ISBN 978-0-7295-8723-5.
 
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