| Abbreviation | Definition |
|---|---|
| JCDEC | Jefferson County Democratic Executive Committee |
| JCDP | Jefferson County Democratic Party |
| JCPOA | Joint Comprehensive Plan of Action |
| JCRP | Jefferson County Republican Party |
| JCRP | Johnson County Republican Party |
| JCS | John Clare Society |
| JD | Jim Derkin, Congressman |
| JD | Junta Democrática |
| JDM | Juggling Democratic Marker |
| JDP | Justice and Development Party |
| JEC | Junta Electoral Central |
| JEM | Jaish-E-Muhammad |
| JEWEL | Joint Endeavor for Welfare, Education, and Liberation |
| JFK | Jihads For Kerry |
| JFK | John Forbes Kerry |
| JFK | John Fortnite Kennedy |
| JFW | Justice for Farmworkers' Campaign |
| JI | Jamaat-e-Islami (Pakistan) |
| JIH | Jama'at-e-Islami Hind |
| JITP | Journal of Information Technology & Politics |