| Acronym | Definition |
|---|
| ISEC➣Information Security (various organizations) |
| ISEC➣Information Security |
| ISEC➣International Society for Ecology and Culture |
| ISEC➣Internal Security |
| ISEC➣Instituto Superior de Engenharia de Coimbra (Portugal) |
| ISEC➣International Superconductive Electronics Conference |
| ISEC➣International Space Elevator Consortium (California) |
| ISEC➣Inclusive and Supportive Education Congress (UK) |
| ISEC➣International Society for Endangered Cats |
| ISEC➣India Software Engineering Conference (est. 2008) |
| ISEC➣International Special Education Congress |
| ISEC➣US Army Information Systems Engineering Command |
| ISEC➣Integrated Shipbuilding Environment Consortium |
| ISEC➣International Symposium on Electromagnetic Compatibility |
| ISEC➣International Science and Education Council |
| ISEC➣International Stirling Engine Conference and Exhibition |
| ISEC➣Interdisciplinary Studies in Early Childhood (academic program) |
| ISEC➣Institute of Science Education and Culture (Kolkata, India) |
| ISEC➣Intermountain Specialty Equipment Company |
| ISEC➣Induction System Evaporative Cooling (aircraft engines) |