| Abbreviation | Definition |
|---|---|
| JVI | Jesuit Volunteers International |
| JVMI | Jack Van Impe Ministries International |
| JVMI | Jewish Voice Ministries International |
| JVP | Jesus Video Project |
| JVP-TX | Jesus Video Project of Texas |
| JW | Jehovah's Witnesses |
| JWFC | Jesus Way Fundamental Church |
| JWM | Justice and Witness Ministries |
| JWRP | Jewish Women's Renaissance Project |
| JX | Jewish Xian |
| JYW | Judaism Your Way |
| K | Kristos |
| K.C. | Knights of Columbus |
| K.S.S. | Knight, Order of Saint Sylvester, Pope |
| K.St.G.G. | Knight, Order of Saint Gregory the Great |
| KABB | Knowledge, Attitudes, Beliefs, and Behaviors |
| KABC | Karbi-Anglong Baptist Convention |
| KANA | KindActs Network Association |
| KB | King's Book |
| KBA | Kiamichi Baptist Assembly |