| Abbreviation | Definition |
|---|---|
| ISA | ISA - The International Society for Measurement and Control |
| ISAA | International Society for Agrochemical Adjuvants |
| ISAAC | International Society for Analysis its Applications and Computation |
| ISAAC | International Society for Augmentative and Alternative Communication |
| ISABS | Indian Society for Applied Behavioural Science |
| ISAC | International Society for Advancement of Cytometry |
| ISAC | International Society for Analytical Cytology |
| ISACB | International Society for Applied Cardiovascular Biology |
| ISAD | International Society for Affective Disorders |
| ISAE | Illinois Society of Association Executives |
| ISAE | Indian Society of Agricultural Engineers |
| ISAE | Indiana Society of Association Executives |
| ISAE | International Society for Applied Ethology |
| ISAE | Iowa Society of Association Executives |
| ISAG | Indian Society Of Applied Geochemists |
| ISAG | International Society of Animal Genetics |
| ISAI | International Society of Applied Intelligence |
| ISAK | International Society for Advanced Kinanthropometry |
| ISAK | International Society for the Advancement of Kinanthropometry |
| ISAK | Islamic Society of Akron and Kent |