| ISEC | Inclusive and Supportive Education Congress 
| Others |
| ISEC | Index for Spatial Extent of Convection
| Others |
| ISEC | Information Systems Engineering Command
| Others |
| ISEC | Institute for Social and Economic Change
| Others |
| ISEC | Institute of Science Education and Culture
| Others |
| ISEC | Instituto Superior de Engenharia de Coimbra
| Others |
| ISEC | Integrated STEM Education Conference
| Others |
| ISEC | Intercollegiate Summer English Camps
| Others |
| ISEC | Intercultural Student Engagement Center
| Others |
| ISEC | Interdisciplinary Science and Engineering Complex
| Others |
| ISEC | International Society for Ecology and Culture
| Others |
| ISEC | International Space Elevator Consortium
| Others |
| ISEC | International Specialist Eye Centre
| Others |
| ISEC | International Structural Engineering and Construction
| Others |
| ISEC | Ipswich Systems Engineering Centre
| Others |