| ITRS | Icase Technical Report Server 
| Others |
| ITRS | Iers Terrestrial Reference System
| Others |
| ITRS | Industrial Ties Research Subprogram
| Others |
| ITRS | Infosys Transaction Reconciliation System
| Others |
| ITRS | Innovative Technology Research Syndicate
| Others |
| ITRS | Intermediate Tripped Rollover Simulation
| Others |
| ITRS | International Tech Rescue Symposium
| Others |
| ITRS | International Technical Rescue Symposium
| Others |
| ITRS | International Technology Roadmap For Semiconductors
| Others |
| ITRS | International Temperate Reefs Symposium
| Others |
| ITRS | International Terrestrial Reference System
| Others |
| ITRS | International Transaction Reporting System
| Others |
| ITRS | Intersection Types and Related Systems
| Others |