| ISRA | Idaho Society of Radio Amateurs 
| Others |
| ISRA | Idaho Society of Radio Amateurs, Inc.
| Others |
| ISRA | IL State Rifle Assoc
| Others |
| ISRA | Illinois Squash Racquets Association
| Others |
| ISRA | Illinois State Racquetball Association
| Others |
| ISRA | Illinois State Rifle Association
| Others |
| ISRA | Illinois Summer Research Academy
| Others |
| ISRA | Image Space Reconstruction Algorithm
| Others |
| ISRA | Indiana State Reading Association
| Others |
| ISRA | Indiana Street Rod Association
| Others |
| ISRA | Industrial Site Recovery Act
| Others |
| ISRA | Industrial Site Recovery Act (New Jersey)
| Others |
| ISRA | Information Security Risk Analysis
| Others |
| ISRA | Information Security Risk Assessment
| Others |
| ISRA | Institut Senegalais de Recherches Agricoles
| Others |
| ISRA | Institute of State and Regional Affairs
| Others |
| ISRA | Institute of State and Regional Affairs (Pennsylvania State University)
| Others |
| ISRA | Intelligent Systems Robotics and Automation
| Others |
| ISRA | Intermarket Symbols Reservation Authority
| Others |
| ISRA | International Sim Racing Association
| Others |
| ISRA | International Slot Racing Association
| Others |
| ISRA | International Society for Research Activity
| Others |
| ISRA | International Society for Research on Aggression
| Others |
| ISRA | International Star Riders Association
| Others |
| ISRA | International Symposium on Robotics and Automation
| Others |
| ISRA | Iowa Street Rod Association
| Others |
| ISRA | Islamic Sciences and Research Academy
| Others |
| ISRA | Islamic Studies and Research Association
| Others |