| IACS | I Am Completely Stupid 
| Others |
| IACS | Illinois Association of Christian Schools
| Others |
| IACS | Illinois Association of College Stores
| Others |
| IACS | Illinois Association of Cosmetology Schools
| Others |
| IACS | Indian Association for the Cultivation of Science
| Others |
| IACS | Indian Association of Classification Societies
| Others |
| IACS | Indiana Association of Christian Schools
| Others |
| IACS | Industrial Automation and Control Systems
| Others |
| IACS | Inertial Attitude Control System
| Others |
| IACS | Information Assurance Consulting Services
| Others |
| IACS | Infosec Assurance And Certification Services
| Others |
| IACS | Innovation Academy Charter School
| Others |
| IACS | Installation Access Control System
| Others |
| IACS | Institute for Advanced Computational Science
| Others |
| IACS | Institute for Applied Cancer Science
| Others |
| IACS | Institute for Applied Computational Science
| Others |
| IACS | Institute for Astrophysics and Computational Sciences
| Others |
| IACS | Integrated Administration and Control System
| Others |
| IACS | Integrated Administration Control System
| Others |
| IACS | Integrated Administrative Computing Services
| Others |
| IACS | Integrated Adminsitration and Control System
| Others |
| IACS | Integrated Air Command Systems
| Others |
| IACS | Intel Authorized Component Supplier
| Others |
| IACS | Inter-Asia Cultural Studies
| Others |
| IACS | International Academy of Cardiovascular Sciences
| Others |
| IACS | International Anneald Copper Standard
| Others |
| IACS | International Annealed Copper Standard
| Others |
| IACS | International Association for Communication and Sport
| Others |
| IACS | International Association of Classification Societies
| Others |
| IACS | International Association Of Counseling Services
| Others |
| IACS | International Association of Cryospheric Sciences
| Others |
| IACS | International Association of the Catalysis Societies
| Others |
| IACS | Intra Asia Cable System
| Others |
| IACS | Inventory and Application Control System
| Others |
| IACS | Iowa Association of Christian Schools
| Others |
| IACS | Italian American Cultural Society
| Others |