| Acronym | Definition |
|---|
| ISCA | International Symposium on Computer Architecture |
| ISCA | International Speech Communication Association |
| ISCA | International Speedway Corporation (stock symbol) |
| ISCA | International Society for Computers and Their Applications |
| ISCA | International Sport and Culture Association (Copenhagen, Denmark) |
| ISCA | Instituto Superior de Ciências Aplicadas (Brazil) |
| ISCA | Indian Science Congress Association |
| ISCA | Institute of Social and Cultural Anthropology (Oxford University; UK) |
| ISCA | Islamic Supreme Council of America |
| ISCA | Independent Schools Council of Australia |
| ISCA | International Show Car Association |
| ISCA | Iowa Student Computer Association |
| ISCA | International Save the Children Alliance |
| ISCA | Irish Setter Club of America |
| ISCA | International Sea Cadet Association (Ottawa, Ontario, Canada) |
| ISCA | International Sports Conditioning Association |
| ISCA | International Scouting Collectors Association (Las Vegas, NV) |
| ISCA | Independent Safety Consultants Association (UK) |
| ISCA | International Shrine Clown Association |
| ISCA | Indiana School Counselor Association |
| ISCA | International Society of Caricature Artists (est. 1989) |
| ISCA | Interior Systems Contractors Association (Ontario, Canada) |
| ISCA | Indiana State Chiropractic Association |
| ISCA | Illinois Soil Classifiers Association |
| ISCA | International Snow Camping Association |
| ISCA | Interlake Sailing Class Association |
| ISCA | Idaho School Counselor Association |
| ISCA | Illinois School Counselor Association |
| ISCA | Iranian Students Cultural Association |
| ISCA | Idle Speed Control Actuator |
| ISCA | Indoor Soccer Coaches Association |
| ISCA | Indiana State Chess Association |
| ISCA | International Student Christian Association (Fayetteville, AR) |
| ISCA | International Shark Class Association |
| ISCA | International Scholarly Communication Alliance |
| ISCA | Information Systems Consultants Association (Atlanta, GA) |
| ISCA | Iowa School Counselors Association |
| ISCA | Image and Sensory ComputAtion (group) |
| ISCA | Intelligent Synchronous Communications Adapter |
| ISCA | Information Society Creativity Award |
| ISCA | Integrated Support Command Alameda (US Coast Guard) |
| ISCA | International Sailing Coaches Association |
| ISCA | Illinois Security Chiefs Association |
| ISCA | Initial Security Classification Assessment |
| ISCA | India Science Congress Association |
| ISCA | Iowa Student Computing Alumni |
| ISCA | International Safe Container Act of 1977 (US) |
| ISCA | International Salon of Contemporary Artists |
| ISCA | Indiana Sprint Car Association |
| ISCA | International Sunfish Class Association, Inc. |
| ISCA | International Sport Chanbara Association |
| ISCA | Internet Sword Collectors Association |
| ISCA | Isabela State College of Agriculture (Philippines) |
| ISCA | Independent Schools Classical Association (UK) |
| ISCA | Independent Schools' Counsellors' Association (Australia) |
| ISCA | Institut Supérieur Commercial et Administratif |
| ISCA | Indiana Soccer Coaches Association, Inc. |
| ISCA | ISDN Selective Call Acceptance |
| ISCA | International Suicide Checkers Association |
| ISCA | International Society of Copier Artists, Ltd |
| ISCA | Integrated Systems Control Architecture |
| ISCA | Indiana Sporting Clays Association, Inc. |
| ISCA | Insulin Secretion Climax |
| ISCA | Indiana State Court Administration |
| ISCA | International Senior Citizens Association, Inc. (est. 1963) |