| Abbreviation | Definition |
|---|---|
| IACS | Innovation Academy Charter School |
| IACS | Iowa Association of Christian Schools |
| IADT | International Academy of Design Technology (Chicago) |
| IADT | International Academy of Design & Technology (Chicago) |
| IAES | International Arab Egyptian School |
| IAHS | Independence Alternative High School |
| IAHS | International Associoation of Hairdressing Schools |
| IAHS | Itawamba Agricultural High School |
| IALS | International Association of Law Schools |
| IAPSC | International Association of Professional School Cleaners |
| IAPSS | Indiana Assoc of Public School Superintendents |
| IAQ | Indoor Air Quality |
| IARS | International Atherosclerosis Research School |
| IASA | Idaho Association of School Administrators |
| IASA | Illinois Association of School Administrators |
| IASB | Illinois Association of School Boards |
| IASC | Itasca Area Schools Collaborative |
| IASN | Illinois Association of School Nurses |
| IBO | International Baccalaureate Organization |
| IBS | International Business School |