| IECC | Illinois Eastern Community Colleges 
| Others |
| IECC | Illinois Energy Conservation Code
| Others |
| IECC | Infant and Early Childhood Conference
| Others |
| IECC | Informix Enterprise Command Center
| Others |
| IECC | Inland Empire Camaro Club
| Others |
| IECC | Inland Empire Community Collaborative
| Others |
| IECC | Inland Empire Corvair Club
| Others |
| IECC | Innovation and Engineering Center California
| Others |
| IECC | Integrated Electronic Control Centre
| Others |
| IECC | Intensive English for College and Careers
| Others |
| IECC | Intercultural E-Mail Classroom Connections
| Others |
| IECC | International E-mail Chess Club
| Others |
| IECC | International Education Counselling Centre
| Others |
| IECC | International Energy Conservation Code
| Others |
| IECC | International Energy Conservation Codes
| Others |
| IECC | International Environmental Code Compliancy
| Others |
| IECC | Internet Explorer Conditional Comment
| Others |
| IECC | Invincible Electric Calculator Company
| Others |
| IECC | Island Evangelical Community Church
| Others |