| Abbreviation | Definition |
|---|---|
| JPFO | Jews for the Preservation of Firearms Ownership |
| JPNG | Jewish Professional Networking Group |
| JRF | Jackie Robinson Foundation |
| JRF | Jeannette Rankin Foundation |
| JRF | Joseph Rowntree Foundation |
| JRPS | Jeddah Ramapuram Pravasi Sangham |
| JS | Joubert Syndrome |
| JSC | Jemion Samson Chikwudi |
| JSDCBD | Jordanian Society for Desertification Control and Badia Development |
| JSDF | Japan Social Development Fund |
| JSF | Joan Scarangello Foundation to Conquer Lung Cancer |
| JSF | Joubert Syndrome Foundation |
| JSFC | Joubert Syndrome Foundation Corporation |
| JSFCLC | Joan Scarangello Foundation to Conquer Lung Cancer |
| JSUK | Joubert Syndrome in the United Kingdom |
| JTFA | James Tatum Foundation for the Arts |
| JTFAI | James Tatum Foundation for the Arts, Inc. |
| JUF | Jennings Urban Fellows |
| JUF | Jewish United Fund |
| JVA | Joyous Volunteer Association |