I
- Kodo
- Signifo
- Lingvo
- Temoj
- IPS
- Instruction Permanente de Sécurité
- In French
- IPS
- Ingénieur Prévention Sécurité
- In French
- IPS
- Intrusion Prevention System
- In English
- IPS
- Indoor Positioning System
- In English
- IPSA
- Institut Polytechnique des Sciences Avancées
- In French
- IPSG
- Intelligence Program Support Group
- In English
- IPSI
- Institut für Integrierte Publikations- und Informationssysteme (www.ipsi.fraunhofer.de)
- In German
- IPSI
- Institut de Presse et des Sciences de l'Information (www.ipsi.rnu.tn)
- In French
- IPSI
- Institut pour la Promotion des Sciences de l'Ingénieur (www.ipsi-cetim.fr)
- In French
- IPSI
- Indemnité Particulière de Sujétion et d'Installation
- In French
- IPSI
- Islamic Propagation Society International
- In English
- IPSJ
- Information Processing Society of Japan
- In English
- IPSL
- Interface Problem Status Log
- In English
- IPSM
- Institut Prince Sidi Mohammed (des Techniciens Spécialisés en Gestion et en Commerce Agricole)
- In French
- IPSN
- Institut de Protection et de Sûreté Nucléaire
- In French
- IPSS
- Integrated Parts Statusing System
- In English
- IPSS
- Integrated Project Scheduling System
- In English
- IPSSE
- IEE Proceedings: Solid-State Electron Devices
- In English
- IPT
- International Civilian Peace-keeping and Peace-building Training
- In English
- IPT
- In-Plant Transporter
- In English
- IPT
- Internal Parameter Table
- In English
- IPT
- Internal Pipe Thread
- In English
- IPT
- International Pipe Thread
- In English
- IPT
- Incapacité Permanente Totale
- In French
- IPT
- Instituto de Pesquisas Tecnológicas (www.ipt.br)
- In Portuguese
- IPTA
- Intractable Pain Treatment Act
- In English
- IPTCS
- Igloo Passive Thermal Control Section
- In English
- IPTEA
- Internacia Poŝtista kaj Telekomunikista Esperanto-Asocio
- In Esperanto
- IPTL
- IEEE (Institute of Electrical and Electronics Engineers) Photonics Technology Letters
- In English
- IPTL
- Institut Pédagogique du Transport et de Logistique
- In French
- IPTM
- Institut des Professions Techniques et Médicales (www.iptm.ma)
- In French
- IPTM
- Instituto Portuário e dos Transportes Marítimos
- In Portuguese
- IPTM
- Institute of Police Technology and Management
- In English
- IPTR
- In-Process Technical Review
- In English
- IPTS
- Indicateur de Prix des Travaux Souterrains
- In French
- IPU
- Inter-Parliamentary Union
- In English
- IPWG
- Integrated Project Working Group
- In English
- IQ
- Ingénieur Qualité
- In French
- IQ
- Intellectual Quotient
- In English
- IQOQI
- Institut für Quantenoptik und Quantenkommunikation (www.iqoqi.at)
= IQOQI | Institute for Quantum Optics and Quantum Information | In English
- In German
- IQOQI
- Institute for Quantum Optics and Quantum Information (www.iqoqi.at)
= IQOQI (look above)
- In English
- IQSA
- International Qajar Studies Association
- In English
- IQSY
- International Quiet Sun Year
- In English
- IQT
- Initial Qualification Training
- In English
- IR
- Investor Relations
- In English
- IR
- Infrared
- In English
- IR
- Inner Roll
- In English
- IR
- Inside Radius
- In English
- IR
- Interchangeability and Replaceability
- In English
- IR
- Interrogator-Responder
- In English
- IR
- Information Retrieval
- In English
- İR
- İsay ra Raver
- In Dimli
- IR&D
- Independent Research and Development
- In English
- IRA
- Individual Retirement Account
- In English
- IRA
- Infrared Astronomy
- In English
- IRA
- Institut Régional d'Administration
- In French
- IRA
- Insuffisance Rénale Aiguë
- In French
- IRA
- Indemnité de Responsabilité Administrative
- In French
- IRA
- Infection Respiratoire Aiguë
- In French
- IRAB
- Infection Respiratoires Aiguë Basse
- In French
- IrAJ
- Irish Astronomical Journal
- In English
- IrAJS
- Irish Astronomical Journal Supplement
- In English
- IRAL
- International Review of Applied Linguistics (https://www.degruyter.com/journal/key/IRAL/html)
- In English
- IRAM
- Instituto Argentino de Racionalización de Materiales (www.iram.com.ar)
- In Spanish
- IRAM
- Input Random Access Memory
- In English
- IRAM
- Institut de Radioastronomie Millimétrique
- In French
- IRAMS
- Inertial Reference Alignment Monitor System
- In English
- IRAN
- Iranian Resources for Academic Needs
- In English
- IRANDOC
- Iranian Information & Documentation Center
- In English
- IRANET
- Iranian Research and Academic Network
- In English
- IRANSAT
- IRANian Government Communications SATellite
- In English
- IRAS
- Inland Revenue Authority of Singapore (https://www.iras.gov.sg/)
- In English
- IRAS
- Infrared Astronomical Satellite
- In English
- IRAS
- Internet Review Arno Schmidt
- In English
- IRAS
- Interreligiöse Arbeitsgemeinschaft in der Schweiz
- In German
- IRAS
- Istituto Spezzino Ricerche Astronomiche
- In Italian
- IRASEC
- Institut de Recherche sur l'Asie du Sud-Est Contemporaine
- In French
- IRB
- Internal Ratings-Based
- In English
- IRB
- Institutional Review Board
The abbreviation IRB (Institutional Review Board) is included in the abbreviation HSIRB (Health Sciences Institutional Review Board).
- In English
- IRB
- International Rugby Board
- In English
- IRBD
- International River Basin District
- In English
- IRBM
- Intermediate-Range Ballistic Missile
The abbreviation IRBM (Intermediate-Range Ballistic Missile) includes the abbreviation BM (Ballistic Missile).
- In English
- IRBS
- Infrared Background Sensor
- In English
- IRBS
- Intermediate-Range Ballistic System
- In English
- IRBS
- Intermediate-Range Booster System
- In English
- IRC
- Innovation Relay Centre
- In English
- IRC
- Internet Relay Chat
- In English
- IRC
- Insufisance Rénale Chronique
- In French
- IRCA
- Innovation Relay Centre Austria (www.irca.at)
- In English
- IRCAD
- Institut de Recherche contre les Cancers de l'Appareil Digestif (https://www.ircad.fr/)
- In French
- IRCAM
- Institut de Recherche et Coordination Acoustique/Musique (www.ircam.fr)
- In French
- IRCANTEC
- Institution de Retraite Complémentaire des Agents Non Titulaires de l'État et des Collectivités locales
- In French
- IRCC
- Institute for Research on Contemporary China
- In English
- IRCCS
- Istituto di Ricovero e Cura a Carattere Scientifico
- In Italian
- IRCCyN
- Institut de Recherche en Communications et Cybernétique de Nantes (www.irccyn.ec-nantes.fr)
- In French
- IRCFE
- Infrared Communications Flight Experiment
- In English
- IRCGN
- Institut de Recherche Criminelle de la Gendarmerie Nationale
- In French
- IRCICA
- Research Centre for Islamic History, Art and Culture
- In English
- IRCJS
- International Research Center for Japanese Studies
- In English
- IRCL
- International Review of Chinese Linguistics
- In English
- IRCOBI
- International Research COmmittee on Biokinetics of Impact
- In French
- IRCOM
- Institut des relations publiques et de la communication
- In French
- IRCS
- Integrated Resource Control System
- In English
- IRCT
- International Rehabilitation Council for Torture Victims
- In English
- IRCT
- Institut de Recherche Cotonnière et des fibres Textiles exotiques
- In French
- IRD
- Institut de Recherche pour le Développement
- In French
- IRD
- Inland Revenue Department
- In English
- IRD
- Information Requirements Description
- In English
- IRD
- Information Requirements Document
- In English
- IRD
- Initiating Reference Document
- In English
- IRD
- Integration Requirements Document
- In English
- IRD
- Interface Requirements Document
- In English
- IrDA
- Infrared Data Association
- In English
- IRDS
- Information Resource Dictionary System
- In English
- IRE
- INstitute of Radio Engineers
- In English
- IRE
- Institutul Naţional Român pentru Studiul Amenajării şi Folosirii Surselor de Energie
- In Romanian
- IREA
- Irana Esperanto-Asocio
- In Esperanto
- IREJO
- Irana Esperantista Junulara Organizo
- In Esperanto
- IREM
- Institut de Recherches sur l'Enseignement des Mathématiques
- In French
- IREP
- Institut de Recherches et d'Études Publicitaires
- In French
- IRES
- Istituto di Ricerche Economiche e Sociali
- In Italian
- IRES
- Institut de Recherches Économiques et Sociales
- In French
- IRESCO
- Institut de Recherche Européen en Sociologie et Socio-économie
- In French
- IRESCO
- Institut de Recherche sur les Sociétés Contemporaines
- In French
- IRESP
- Institut de Recherche en Santé Publique
- In French
- IREWG
- Institute for Research and Education on Women and Gender (www.womenandgender.buffalo.edu)
- In English
- IREX
- Institut pour la Recherche appliquée et l'EXpérimentation en génie civil
- In French
- IRF
- Interreligiöses Forum Basel
- In German
- IRG
- Inertial Rate Gyro
- In English
- IRG
- (Marie Curie) International Reintegration Grants
- In English
- IRG
- Internationale des Résistants à la Guerre
- In French
- IRH
- International Review of Hydrobiology
- In English
- IRH
- Institut des Ressources Humaines (www.irh-sup.com)
- In French
- IRI
- Islamic Research Institute
- In English
- IRI
- Internationalized Resource Identifier
- In English
- IRI
- Institut de Recherche et d'Innovation (www.iri.centrepompidou.fr)
- In French
- IRIG
- Inertial Rate Integrating Gyroscope
- In English
- IRIG
- Inertial Reference Integrating Gyroscope
- In English
- IRIG
- Interrange Instrumentation Group
- In English
- IRIS
- Institut des Relations Internationales et Stratégiques (www.iris-france.org)
- In English
- IRIS
- Imaginons un Réseau Internet Solidaire
- In French
- IRIS
- Infrared Instrumentation System
- In English
- IRIS
- Italian Research Interim Stage
- In English
- IRIS
- Indexation et Reconnaissance d'Images par la Sémantique
- In French
- IRIS
- Inter-Regiona Internacia Semajno
- In Esperanto
- IRIS
- Incorporated Research Institutions for Seismology (www.iris.edu)
- In English
- IRIS
- Immobilisations Regroupées et Inventoriées sous SAP
- In French
- IRIS
- Institut de Recherches sur les Implications de la langue des Signes
- In French
- IRIS
- Institut Régional Informatique Supérieur de Nantes
- In French
- IRIT
- Institut de Recherche Informatique de Toulouse (www.irit.fr)
- In French
- IRIT
- Institut de Recherche en Informatique de Toulouse
- In French
- IRIZ
- International Research Institute for Zen Buddhism (http://iriz.hanazono.ac.jp)
- In English
- IrJST
- Iranian Journal of Science and Technology
- In English
- IRK
- Internacia Respondkupono
- In Esperanto
- IRKS
- Institut für Rechts- und Kriminalsoziologie
- In German
- IRL
- Initiating Reference List
- In English
- IRL
- Interface Requirements List
- In English
- IRM
- Imagerie par Résonance Magnétique
= MRI | Magnetic Resonance Imagery | In English
- In French
- IRM
- Information Resource Management
- In English
- IRM
- Integrated Range Mission
- In English
- IRM
- Institut Royal Météorologique de Belgique
= KMI | Koninklijk Meteorologisch Instituut | In Dutch
- In French
- IRM
- Idéale Résidence Mobile
- In French
- IRMB
- Institut Royal Météorologique de Belgique
- In French
- IRMBP
- Institut Royal Météorologique de Belgique, Publications
- In French
- IRME
- Initiator Resistance Measuring Equipment
- In English
- IRMI
- Integrita Retbazita Medio de Informlaborantoj
- In Esperanto
- IRN
- Interface Revision Notice
The abbreviation IRN (Interface Revision Notice) is included in abbreviations such as PIRN (Preliminary Interface Revision Notice) and PIRN (Proposed Interface Revision Notice).
- In English
- IRN
- Interim Revision Notice
- In English
- IRNIK
- Institut für das Recht der Netzwirtschaften, Informations- und Kommunikationstechnologie (www.irnik.de)
- In German
- IRNP
- International Review of Nuclear Physics
- In English
- IRO
- International Refugee Organization
= OIR | Organisation Internationale pour les Réfugiés | In French
- In English
- IRP
- Intramural Research Program
- In English
- IRP
- Inertial Reference Package
- In English
- IRP
- Institutions Représentatives du Personnel
- In French
- IRPC
- International Reviews in Physical Chemistry
- In English
- IRPC
- Incubateur Régional Poitou-Charentes
- In French
- IRPI
- Institut de Recherche en Propriété Intellectuelle (www.irpi.ccip.fr)
- In French
- IRPP
- Impôt sur le Revenu des Personnes Physiques
- In French
- IRQ
- Institut de Recherche sur le Québec (www.irq.qc.ca)
- In French
- IRQ
- Interrupt Request
- In English
- IRQ
- Idle Repeat Request
- In English
- IRR
- Independent Readiness Review
The abbreviation IRR (Independent Readiness Review) includes the abbreviation RR (Readiness Review).
- In English
- IRR
- Initial Requirements Review
The abbreviation IRR (Initial Requirements Review) includes the abbreviation RR (Requirements Review).
- In English
- IRR
- Inspection Rejection Report
- In English
- IRR
- Integral Rocket Ramjet
- In English
- IRR
- Integrated Readiness Review
The abbreviation IRR (Integrated Readiness Review) includes the abbreviation RR (Readiness Review).
- In English
- IRR
- Interface Requirements Review
The abbreviation IRR (Interface Requirements Review) includes the abbreviation RR (Requirements Review).
- In English
- IRR
- Individual Ready Reserve
- In English
- IRRI
- International Rice Research Institute (www.irri.org)
- In English
- IRRI
- International Rice Reserch Institute
- In English
- IRRMA
- Institut Romand de Recherche Numérique en Physique de Matériaux
- In French
- IRS
- Internal Revenue Service
- In English
- IRS
- Institute of Regional Studies
- In English
- IRS
- Interface Requirements Specification
- In English
- IRSC
- Instituts de recherche en santé du Canada (www.cihr.ca)
= CIHR | Canadian Institutes of Health Research | In English
- In French
- IRSEA
- Institut de Recherche sur le Sud-Est Asiatique
- In French
- IRSEEM
- Institut de Recherche en Systèmes Électroniques Embarqués
- In French
- IRSN
- Institut de Radioprotection et de Sécurité Nucléaire
- In French
- IRSST
- Institut de recherche Robert-Sauvé en santé et sécurité du travail (https://www.irsst.qc.ca)
- In French
- IRST
- Infrared Search Track
- In English