IRI may refer to:

• The Islamic Republic of Iran
• Internationalized Resource Identifier, a generalization of the Uniform Resource Locator (URL), a World Wide Web resource allowing the use of Unicode
• International Roughness Index, a dimensionless quantity used for measuring road roughness, proposed as a world standard by the World Bank

Businesses and organizations:

• Intellectual Reserve, Inc., a legal entity of The Church of Jesus Christ of Latter-day Saints
• International Republican Institute, a U.S. federal budget funded institution involved with national political parties around the world
• Istituto per la Ricostruzione Industriale, an Italian industrial public group
• International Research Institute for Climate and Society, Columbia University based organization focusing on climate risk management
• International Resistance Initiative/Initiative de résistance internationaliste, a group claiming responsibility for two acts of sabotage in Québec in 2004 and 2006

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