| Abbreviation | Definition |
|---|---|
| JCS | Jewish Community Services |
| JCSA | Jose Carreras Society of America |
| JCSA | Joseph Conrad Society of America |
| JCSA | Journal of the Catch Society of America |
| JCSANA | Jewish Communal Service Association of North America |
| JCSC | Jain Center of Southern California |
| JCSF | Johnson City Sports Foundation |
| JCSNA | John Clare Society of North America |
| JCSO | Jewish Community Service Organization |
| JCSSF | Jewish Community Services of South Florida |
| JCSTC | Joint Council for Scientific and Technical Communication |
| JCUSA | Jubilee Campaign United States of America |
| JCWF | Jackson County Wildlife Fund |
| JCWF | Jaycees of Wisconsin Foundation |
| JCWF | Johan Cruyff Welfare Foundation |
| JDAC | Juvenile Diabetes Awareness club |
| JDC | Joint Distribution Committee |
| JDC | Joslin Diabetes Center for transplant research |
| JDEF | John Dewey Education Foundation |
| JDEF | Juvenile Diabetes Enrichment Fund |