| IRTC | Illinois Rural TeleCommunication 
| Others |
| IRTC | Illinois Rural TeleCommunication in Computing
| Others |
| IRTC | Immaterial Replacement Training Center
| Others |
| IRTC | Incheon Rapid Transit Corporation
| Others |
| IRTC | Independent Radio and Television Commission
| Others |
| IRTC | Independent Rough Terrain Center
| Others |
| IRTC | Indianapolis Regional Transportation Council
| Others |
| IRTC | Indonesian RC Tank Community
| Others |
| IRTC | Industrial Refrigeration Technical College
| Others |
| IRTC | Infantry Replacement Training Center
| Others |
| IRTC | Institute for Religion, Technology, and Culture
| Others |
| IRTC | Institute of Robotics and Technical Cybernetics
| Others |
| IRTC | Institutional Reconciliation and Transformation Commission
| Others |
| IRTC | Instructional Resource and Technology Center
| Others |
| IRTC | Instructional Resource Technology Center
| Others |
| IRTC | Integrated Research and Training Center
| Others |
| IRTC | Integrated Resource Timber Contract
| Others |
| IRTC | Integrated Rural Technology Centre
| Others |
| IRTC | Intensive Residential Treatment Center
| Others |
| IRTC | Inter Regularity Time Control
| Others |
| IRTC | Interlake Reserves Tribal Council
| Others |
| IRTC | International Recommended Transit Corridor
| Others |
| IRTC | International Research and Training Center
| Others |
| IRTC | International Research Terms and Conditions
| Others |
| IRTC | International Rolling Technology Course
| Others |
| IRTC | Internationally Recommended Transit Corridor
| Others |
| IRTC | Internet Ray Tracing Competition
| Others |
| IRTC | Internet Raytracing Competition
| Others |
| IRTC | Internet Resources for Technical Communicators
| Others |
| IRTC | Intestinal Rehabilitation and Transplantation Center
| Others |
| IRTC | Intuitive Research and Technology Corporation
| Others |
| IRTC | Investment Recovery Trade Corporation
| Others |