| IRSP | Independent Research Summer Program 
| Others |
| IRSP | Information and Reporting Services Portal
| Others |
| IRSP | Institut Regional de Sante Publique
| Others |
| IRSP | Instrumentation Radar Support Program
| Others |
| IRSP | Insulated Roller Shutter Products
| Others |
| IRSP | Integrated Regional Support Program
| Others |
| IRSP | Integrated Regional Support Programme
| Others |
| IRSP | Integrated Rural Support Programme
| Others |
| IRSP | Intelligent Robot Software Platform
| Others |
| IRSP | International Research and Studies Program
| Others |
| IRSP | International Research by Students Programme
| Others |
| IRSP | International Research Scholars Program
| Others |
| IRSP | International Review of Social Psychology
| Others |
| IRSP | Intramural and Recreational Sports Program
| Others |
| IRSP | Intramural Research Support Program
| Others |
| IRSP | Investigative Research Scholars Program
| Others |
| IRSP | Irish Republican Socialist Party
| Others |