| IRTP | Graphics (Graphicon-2000 Interactive Real-Time PHIGS) 
| Others |
| IRTP | Integrated Rural Training Pipeline
| Others |
| IRTP | Intensive Remedial Teaching Programme
| Others |
| IRTP | Intensive Residential Treatment Program
| Others |
| IRTP | Intensive Residential Treatment Programs
| Others |
| IRTP | Inter Registrar Transfer Policy
| Others |
| IRTP | Inter-Registrar Transfer Policy
| Others |
| IRTP | Internal Revenue Tax Paid
| Others |
| IRTP | International Registered Testing Pool
| Others |
| IRTP | International Religious Tourism and Pilgrimage
| Others |
| IRTP | Internet Reliable Transaction Protocol
| Others |
| IRTP | Interservice Respiratory Therapy Program
| Others |