IRIS

• Immune Reconstitution Inflammatory Syndrome.
• Incorporated Research Institutions for Seismology
• Information Regarding Israel's Security
• Infrastructure for Resilient Internet Systems
• Integrated Risk Information System
• Interface Region Imaging Spectrograph
• International Railway Industry Standard
• International Relations for Incoming Students
• International Renal Interest Society
• International Research Institute of Stavanger
• Internet Registry Information Service
• Internet Router In Space
• Iris Recognition Immigration System
• Islamic Republic of Iran Ship
• Italian Research Interim Stage