| ITSR | Independent Transport Safety Regulator 
| Others |
| ITSR | Indirect Tensile Strength Ratio
| Others |
| ITSR | Information Technician Seaman Recruit
| Others |
| ITSR | Information Technology Service Request
| Others |
| ITSR | Information Technology Strategic Research
| Others |
| ITSR | Insider Threat Spotlight Report
| Others |
| ITSR | Institute for Trade Studies and Research
| Others |
| ITSR | Institute for Trade Studies Research
| Others |
| ITSR | Institute for Treatment and Services Research
| Others |
| ITSR | Institute of Tribal Studies and Research
| Others |
| ITSR | Iranian Transactions And Sanctions
| Others |
| ITSR | Iranian Transactions And Sanctions Regulations
| Others |