| I&R | Interchangeability And Replaceability 
| Others |
| I&R | Interchangeable (Interchangeability) & Replaceable (Replaceability)
| Others |
| I&R | Interchangeable and Replaceable
| Others |
| I/R | Interchange/Replacement
| Others |
| I/R | Internment/resettlement
| Others |
| I/R | Internment/Resettlement (Battalion)
| Military |
| IR | I Remember
| Others |
| IR | Ideal Reader
| Others |
| IR | Ideal Reno
| Others |
| IR | Ignominious Redhead
| Others |
| IR | Ignorant Runt
| Others |
| IR | Illinois RailNet
| Others |
| IR | Illinois RailNet Incorporated
| Others |
| IR | Illuminated Reticle
| Others |
| IR | Im Ripped
| Others |
| IR | Im Ruhestand
| Others |
| IR | Image Runner
| Others |
| IR | Imaging Infrared
| Technology, Networking, Satellite Technology |
| IR | Immediate Relative
| Others |
| IR | Immediate Release
| Others |
| IR | Immune Response
| Others |
| IR | Immunization Registry
| Others |
| IR | immunoreactive
| Others |
| IR | Impact Resistant
| Others |
| IR | Imperial Reign
| Others |
| IR | Implementing Regulation
| Others |
| IR | Importancy Rating
| Others |
| IR | Imposto de Renda
| Others |
| IR | Impotent Robot
| Others |
| IR | Improved Rocker
| Others |
| IR | Improvement Request
| Others |
| IR | Impulse Response
| Others |
| IR | In Relation
| Others |
| IR | In Remembrance
| Others |
| IR | Incident Record
| Others |
| IR | Incident Report
| Others |
| IR | Inclination of the Ascending Return
| Others |
| IR | Income Ratio
| Others |
| IR | Income Restoration
| Others |
| IR | Indearing Rapist
| Others |
| IR | Independent Review
| Others |
| IR | Independent Runner
| Others |
| IR | Index of Response
| Others |
| IR | Index Return
| Others |
| IR | Indian Railway
| Others |
| IR | Indian Railways
| Others |
| IR | Indigenous Resistance
| Others |
| IR | Individual Rationality
| Others |
| IR | Individual Referral
| Others |
| IR | Individual Regulation
| Others |
| IR | Individually Rational
| Others |
| IR | Industrial Reform
| Others |
| IR | Industrial Relations
| Others |
| IR | Industrial Research
| Others |
| IR | Industrial Revolution
| Others |
| IR | Industrial Robot
| Others |
| IR | Inferior Rectus
| Others |
| IR | Information Rate
| Others |
| IR | Information Ratio
| Others |
| IR | Information Register
| Others |
| IR | Information Requirement
| Others |
| IR | Information Requirements
| Others |
| IR | Information Retrieval
| Others |
| IR | Infrared
| Science, Radiology |
| IR | Infrared Radiation
| Others |
| IR | Infrared rays
| Others |
| IR | Infrared Receiver
| Others |
| IR | Infrared Remote
| Others |
| IR | Inherent Risk
| Others |
| IR | Initialization And Refresh
| Others |
| IR | Initially Rotated
| Others |
| IR | Injured Reserve
| Others |
| IR | Inland Revenue
| Others |
| IR | Insert Relation
| Others |
| IR | Inside Radius
| Others |
| IR | Inspection Request
| Others |
| IR | Inspired Reasoning
| Others |
| IR | Installation Restoration
| Others |
| IR | Institutional Research
| Others |
| IR | Instruction Register
| Others |
| IR | Instructions Read
| Others |
| IR | Instrument Rating
| Others |
| IR | Instrument Reference
| Others |
| IR | Insulation Resistance
| Others |
| IR | Insulin Resistance
| Others |
| IR | Intelligence Ratio
| Others |
| IR | Intelligence Requirement
| Others |
| IR | Intelligent Remote
| Others |
| IR | Interaction Region
| Others |
| IR | Interest Rate
| Others |
| IR | Interface Region
| Others |
| IR | Interface Repository
| Others |
| IR | Interim Release
| Others |
| IR | Interim Report
| Others |
| IR | Intermediate Representation
| Others |
| IR | Internal Reduction
| Others |
| IR | Internal Relations
| Others |
| IR | Internal Replenishment
| Others |
| IR | Internal Representation
| Others |
| IR | Internal Resistance
| Others |
| IR | Internal Rotation
| Others |
| IR | internal rotation Rehabilitation medicine
| Others |
| IR | International Relation
| Others |
| IR | International Relations
| Others |
| IR | International Rendezvous
| Others |
| IR | International Rescue
| Others |
| IR | International Resistor Corporation
| Others |
| IR | International Roach
| Others |
| IR | International Roaming
| Others |
| IR | Internet Registry
| Others |
| IR | Internship Required
| Others |
| IR | Interregional Research
| Others |
| IR | Interval Restriction
| Others |
| IR | Interventional Radiology
| Others |
| IR | Introduction Remedial
| Others |
| IR | inversion recovery Imaging MRI
| Others |
| IR | Inverted Repeat
| Others |
| IR | inverted repeat Molecular biology
| Others |
| IR | Investment Rules
| Others |
| IR | Investor Relation
| Others |
| IR | Investor Relations
| Others |
| IR | Invisible Rocket
| Others |
| IR | Invoice Receipt
| Others |
| IR | Inward Remittance
| Others |
| IR | Ionising Radiation
| Others |
| IR | IR Inferior rectus
| Others |
| IR | Iridium
| Element |
| IR | Iron Replacement
| Others |
| IR | Irreducible Representation
| Others |
| IR | Islamic Religion
| Others |
| IR | Islamic Republic
| Others |
| IR | Islamic Revolution
| Others |
| IR | Issue Request
| Others |
| IR | Issues Remaining
| Others |
| IR | Izquierda Republicana
| Others |
| IR | Not Injury Report
| Others |
| IR | Pointer Infrared Pointer
| Others |
| IR | Sites in Islamic Republic Of Iran
| Others |
| IR | The Interquantile Range
| Others |