| ISCA | I save children anywhere 
| Others |
| ISCA | Idaho School Counselor Association
| Others |
| ISCA | Idaho School Counselors Association
| Others |
| ISCA | Idle Speed Control Actuator
| Others |
| ISCA | Illinois School Counselor Association
| Others |
| ISCA | Illinois Soil Classifiers Association
| Others |
| ISCA | Independent Schools Cultural Alliance
| Others |
| ISCA | Indiana School Counselor Association
| Others |
| ISCA | Indiana Soccer Coaches Association
| Others |
| ISCA | Indiana Sporting Clays Association
| Others |
| ISCA | Indiana Sprint Car Association
| Others |
| ISCA | Indiana State Chiropractic Association
| Others |
| ISCA | Indoor Soccer Coaches Association
| Others |
| ISCA | Information Strategic Cloze Assessment
| Others |
| ISCA | Inline Skating Club of America
| Others |
| ISCA | Institutio Superior De Ciencas Agropecuaria
| Others |
| ISCA | Integrated Support Command Alameda
| Others |
| ISCA | Intelligent Synchronous Communications Adapter
| Others |
| ISCA | International Safety Coach Association
| Others |
| ISCA | International School Counselor Association
| Others |
| ISCA | International Scouting Collectors Association
| Others |
| ISCA | International Seascape18 class association
| Others |
| ISCA | International Show Car Association
| Others |
| ISCA | International Show Caves Association
| Others |
| ISCA | International Shrine Clown Association
| Others |
| ISCA | International Society for Computers and Their Applications
| Others |
| ISCA | International Society for Conversation Analysis
| Others |
| ISCA | International Society for Copier Artists
| Others |
| ISCA | International Society of Caricature Artists
| Others |
| ISCA | International Society of Christian Apologetics
| Others |
| ISCA | International Speech Communication Association
| Others |
| ISCA | International Sport and Culture Association
| Others |
| ISCA | International Sports Conditioning Association
| Others |
| ISCA | International Standards for Cytogenomic Arrays
| Others |
| ISCA | International Student Christian Association
| Others |
| ISCA | International Swim Coaches Association
| Others |
| ISCA | International Systemic Constellations Association
| Others |
| ISCA | Interrupt Status Control A
| Others |
| ISCA | Ionization Spectroscopy for Chemical Analysis
| Others |
| ISCA | Iowa School Counselor Association
| Others |
| ISCA | Iowa Student Computer Association
| Others |
| ISCA | Iranian Student Cultural Association
| Others |
| ISCA | Iranian Students Cultural Association
| Others |
| ISCA | Irish Setter Club of America
| Others |
| ISCA | Isabela State College of Agriculture
| Others |