| IRRP | Indirect Reuse Replenishment Project 
| Others |
| IRRP | Individual Responsible for Radiation Protection
| Others |
| IRRP | Information Recherche Retinite Pigmentaire
| Others |
| IRRP | Infrastructure Repair and Replacement Plan
| Others |
| IRRP | Installation Restoration Research Program
| Others |
| IRRP | Integrated Regional Resource Plan
| Others |
| IRRP | Integrated Regional Resource Planning
| Others |
| IRRP | Integrated Regional Resources Plan
| Others |
| IRRP | Integrated Resource and Resilience Planning
| Others |
| IRRP | Interdisciplinarity and Relating Research with Practice
| Others |
| IRRP | International Registry of Reproductive Pathology
| Others |
| IRRP | Irene Rinehart Riverfront Park
| Others |