| Term | Definition / Meaning / Stand for |
| JICM |
Jesus Is Coming Ministries |
| JMC |
Jesus Missionary Church |
| JMF |
Jesus Ministry Fellowship |
| JMG |
Jesus Ministry Group |
| JNS |
Jesus Name Society |
| JSCM |
Jesus Saves Church Ministries |
| JSM |
Jesus Saves Ministries |
| Jr. |
Junior (commonly used in Christian naming) |
| K.C. |
Knights of Columbus |
| KBC |
Kingdom Baptist Church |
| KCAI |
Kingdom Christian Academy International |
| KCH |
Kingdom Church of Holiness |
| KFM |
Kingdom Fellowship Ministries |
| KFW |
Kingdom Family Worship |
| KFWC |
Kingdom Family Worship Center |
| KJC |
Kingdom Jesus Christ Church |
| KJV |
King James Version (Bible) |
| KPC |
Kingdom Power Church |
| KSI |
Krishna Swaminarayan International |
| Kabb. |
Kabbalah |
| Kosher |
Referring to Jewish dietary laws |
| L.P. |
Liturgical Prayer |
| L.T.S. |
Lutheran Theological Seminary |
| LBCI |
Lutheran Bible College International |
| LBS |
Lutheran Bible School |
| LCT |
Lutheran Church Training |
| LDC |
Lutheran Development Center |
| LDS |
Latter-Day Saints |
| LDSJG |
Little Daughters of Saint John Gaulbert |
| LIS |
Lutheran Institute of Studies |
| LMA |
Lutheran Mission Association |
| LSDP |
Little Sisters of Divine Providence |
| LUMC |
Lutheran United Methodist Church |
| LWF |
Lutheran World Federation |
| LWR |
Lutheran World Relief |
| M.A. |
Master of Arts (in theology or religious studies) |
| M.C. |
Missionary Church |
| M.C.C. |
Metropolitan Community Church |
| M.S. |
Master of Science (in theology, often used in academic contexts) |
| MBC |
Missionary Baptist Church |
| MCA |
Missionary Christian Assembly |
| MCC |
Missionary Church Conference |
| MCCS |
Missionary Christian Church Society |
| MCSH |
Missionary Catechists of the Sacred Heart |
| MDA |
Muslim Deen Academy |
| MEC |
Methodist Episcopal Church |
| MIM |
Missionary International Movement |
| MNA |
Missionary National Assembly |
| MOC |
Ministry Outreach Center |
| MPA |
Ministry Preparation Academy |
| MPS |
Ministry Program Services |
| MPT |
Missionary Prayer Team |
| MSC |
Missionary Society of Christ |
| MSMI |
Missionary Sisters of Mary Immaculate |
| MST |
Missionary Support Team |
| N.C.C. |
National Council of Churches |
| N.D. |
Notre Dame |
| N.O. |
New Order |
| N.S. |
Novus Ordo Missae (New Order of Mass) |
| NAA |
National Apostolic Assembly |
| NCC |
National Council of Churches |
| NCCB |
National Conference of Catholic Bishops |
| NCP |
National Christian Party |
| NCS |
National Christian Society |
| NDS |
Notre Dame Sisters |
| NFP |
New Faith Program |
| NIV |
New International Version (Bible) |
| NLC |
New Life Church |
| NLCF |
New Life Christian Fellowship |
| NLS |
New Life Services |