| AC | Apostolic Carmel | In English | → Roman catholic church |
| ACCRI | Associazione di Cooperazione Cristiana Internazionale | In Italian | → Associations → Development |
| ACEC | Associazione Cattolica Esercenti Cinema | In Italian | → Associations → Roman catholic church → Cinema, movies |
| AcF | Akademie für christliche Führungskräfte | In German | → Academies → Economics |
| ACHA | American Catholic Historical Association | In English | → Associations → Roman catholic church → History |
| ACU | Australian Catholic University | In English | → Roman catholic church → Higher education, universities |
| ACV | Algemeen Christelijk Vakverbond = CSC | Confédération des Syndicats Chrétiens | In French |
In Dutch | → Organizations and associations → Labour, labour economics |
| ADRA | Adventist Development and Relief Agency | In English | → Organizations and associations → Development |
| AECQ | Assemblée des Évêques Catholiques du Québec | In French | → Roman catholic church |
| AFA | American Family Association | In English | → Associations |
| AIEP | Association Internationale des Études Patristiques = IAPS | International Association of Patristics Studies | In English |
In French | → Associations → Archeology → Roman catholic church |
| AiG | Answers in Genesis | In English | |
| AMA | Ausiliarie Missionarie Agostiniane | In Italian | → Roman catholic church |
| AMORC | Alter Mystischer Orden Rosae Crucis | In German | |
| AO | Apostolic Oblates | In English | → Roman catholic church |
| ARA | Amore Riparazione e Apostolato | In Italian | |
| ARN | Access Research Network (www.arn.org) | In English | |
| ASC | Adorers of the Blood of Christ | In English | → Roman catholic church |
| ASDAH | Association of Seventh-Day Adventist Historians | In English | → Associations → History |
| ASI | Ancillae Secular Institute | In English | → Roman catholic church |
| ASMI | Apostolic Sisters of Mary Immaculate | In English | → Roman catholic church |
| ASMI | Assisi Sisters Of Mary Immaculate | In English | → Roman catholic church |
| BA | (The) Biblical Archaeologist | In English | → Serial publications, periodicals → Archeology |
| BCV | Bergumer Christelijke Voetbalclub | In Dutch | → Organizations and associations → Football and rugby |
| BCVS | Bornese Christelijke Sport Vereniging | In Dutch | → Organizations and associations → Sport, physical exercises |
| BOR | Biserica Ortodoxă Română | In Romanian | |
| BSG | Bibelgruppe für Studierende | In German | |
| CAB | Congregation of Alexian Brothers | In English | → Roman catholic church |
| CBS | Christliche Bekenntnisschule | In English | |
| CBZ | Christliches Begegnungszentrum | In German | |
| CCCB | Canadian Conference of Catholic Bishops = CECC | Conférence des Évêques Catholiques du Canada | In French |
In English | → Organizations and associations → Roman catholic church |
| CCIS | Conférence Canadienne des Instituts Séculiers = CCSI | Canadian Conference of Secular Institutes | In English |
In French | |
| CCSI | Canadian Conference of Secular Institutes = CCIS (look above) |
In English | |
| CCV | Carmelite Sisters of Charity of Vedruna | In English | → Roman catholic church |
| CECC | Conférence des Évêques Catholiques du Canada = CCCB (look above) |
In French | → Organizations and associations → Roman catholic church |
| CEI | Chiesa Evangelica Italiana | In Italian | |
| CFIC | Congregation of the Sons of Immaculate Conception | In English | → Roman catholic church |
| CFTC | Confédération Française des Travailleurs Chrétiens | In French | → Organizations and associations → Labour, labour economics |
| CGB | Christlicher Gewerkschaftsbund | In German | → Organizations and associations → Labour, labour economics |
| CHA | Catholic Health Association | In English | → Associations → Roman catholic church → Medicine |
| CHF | Congregation of The Holy Family | In English | → Roman catholic church |
| CIIR | Catholic Institute for International Relations | In English | → Roman catholic church → International relations |
| CJA | Christlich-Jüdische Arbeitsgemeinschaft Basel | In German | → Associations → Judaism |
| CJP | Christlich-Jüdische Projekte | In German | → Judaism |
| CJV | Christelijke Jongeren Vereniging | In Dutch | → Organizations and associations |
| CJVV | Christelijke Jongelieden Voetbal Vereniging | In Dutch | → Organizations and associations → Football and rugby |
| CLMC | Comunità Laici Missionari Cattolici | In Italian | → Organizations and associations → Roman catholic church |
| CM | Congregation of the Mission | In English | → Roman catholic church |
| CM | Carmelite Missionaries | In English | → Roman catholic church |
| CMC | Congregation of The Mother Of Carmel | In English | → Roman catholic church |
| CMF | Claretian Missionary Fathers | In English | → Roman catholic church |
| CMI | Centro Misionero Iberoamericano | In Spanish | |
| CMI | Carmelites of Mary Immaculate | In English | |
| CMIS | Conférence Mondiale des Instituts Séculiers | In French | |
| CMSF | Congregation of the Missionaries of Saint Francis Sales | In English | → Roman catholic church |
| CNV | Christelijke Noordwijkerhoutse Voetbalclub | In Dutch | → Organizations and associations → Football and rugby |
| COB | Church of the Brethren | In English | → Protestant churches |
| CoUCL | Contributions de l'Universite Catholique de Louvain | In French | → Serial publications, periodicals → Roman catholic church → Higher education, universities |
| COV | Christelijke Ontspannings Vereniging | In Dutch | → Organizations and associations → Sport, physical exercises |
| CR | Congregation of the Rosarians | In English | → Roman catholic church |
| CSB | Christelijke Sportclub Baflo | In Dutch | → Organizations and associations → Sport, physical exercises |
| CSC | Confédération des Syndicats Chrétiens = ACV (look above) |
In French | → Organizations and associations → Labour, labour economics |
| CSC | Congregation of The Sisters Of Charity | In English | → Roman catholic church |
| CSCA | Christelijke Sport Club Actief | In Dutch | → Organizations and associations → Sport, physical exercises |
| CSEL | Corpus der lateinischen Kirchenväter = CSEL | Corpus Scriptorum Ecclesiasticorum Latinorum | In Latin = CSEL | Corpus of the Latin Church Fathers | In English |
In German | → Libraries → Roman catholic church |
| CSEL | Corpus Scriptorum Ecclesiasticorum Latinorum = (look above) |
In Latin | → Libraries → Roman catholic church |
| CSEL | Corpus of the Latin Church Fathers = (look above) |
In English | → Libraries → Roman catholic church |
| CSIC | Centre for the Study of Islam and Christian-Muslim Relations | In English | → Islam |
| CSN | Congregation of The Sisters Of Nazareth | In English | → Roman catholic church |
| CSV | Christelijke Sport Vereniging | In Dutch | → Organizations and associations → Sport, physical exercises |
| CSVC | Christelijke Sport Vereniging Coevorden | In Dutch | → Organizations and associations → Sport, physical exercises |
| CSVD | Christelijke Sportclub Vitesse Delft | In Dutch | → Organizations and associations → Sport, physical exercises |
| CSVH | Christelijke Sport Vereniging Hoogkerk | In Dutch | → Organizations and associations → Sport, physical exercises |
| CUED | Cambridge University Engineering Department (www.eng.cam.ac.uk) | In English | → 278 → Engineering, technology |
| CVBVB | Christelijke Voetbal Vereniging Bedum | In Dutch | → Organizations and associations → Football and rugby |
| CVSB | Christelijke Voetbalvereniging Scheemder Boys | In Dutch | → Organizations and associations → Football and rugby |
| CVVA | Christelijke Voetbal Vereniging Arnhem | In Dutch | → Organizations and associations → Football and rugby |
| CVVO | Christelijke Vereniging Voor Ontspanning | In Dutch | → Organizations and associations → Sport, physical exercises |
| CVW | Christelijke Voetbalclub Winschoten | In Dutch | → Organizations and associations → Football and rugby |
| CWL | Catholic Women's League of Canada (www.cwl.ab.ca) | In English | → Organizations and associations → Roman catholic church |
| DBLA | Don Bosco Lay Association | In English | → Associations → Roman catholic church |
| DC | Disciples of Christ | In English | → Roman catholic church |
| DCPB | Daughters of Charity of the Most Precious Blood | In English | → Roman catholic church |
| DCTB | Deutscher Christlicher Techniker-Bund | In German | → Organizations and associations → Labour, labour economics |
| DDP | Daughters of Divine Providence | In English | → Roman catholic church |
| DML | Daughters of Saint Mary of Leuca | In English | → Roman catholic church |
| DP | Society of Devapriya Sisters | In English | → Roman catholic church |
| DPM | Daughters of Presentation of Mary in the Temple | In English | → Roman catholic church |
| DSC | Daughters of Saint Camillus | In English | → Roman catholic church |
| DSFS | Daughters of Saint Francis de Sales | In English | → Roman catholic church |
| DSHJ | Daughters of the Sacred Heart of Jesus | In English | → Roman catholic church |
| DSHJ | Daughters of Sacred Heart of Jesus | In English | → Roman catholic church |
| DSJ | Daughters of Saint Joseph | In English | → Roman catholic church |
| DST | Daughters of Saint Thomas | In English | → Roman catholic church |
| ÉAPP | Équipe d’Animation Pastorale des Paroisses | In French | |
| ECSR | Enabling Christians in Serving Refugees | In English | → Migrations |
| EO | Evangelische Omroep | In Dutch | |
| EURD | Église Universelle du Royaume de Dieu = IURD | Iglesia Universal del Reino de Dios | In Spanish = IURD | Igreja Universal do Reino de Deus | In Portuguese = UCKG | Universal Church of the Kingdom of God | In English |
In French | → Modern spiritual movements |
| EVP | Evangelische Volkspartei (www.evppev.ch) = PEV | Parti Évangélique | In French |
In German | → International relations |
| FCC | Franciscan Clarist Congregation | In English | → Roman catholic church |
| FDSHJ | Fervent Daughters of the Saint Heart of Jesus | In English | → Roman catholic church |
| FEO | Federatie Evangelische Zorg-Organisaties (www.feozorg.nl) | In Dutch | → Organizations and associations → Protestant churches → Social aid |
| FEREDE | Federación de Entidades Religiosas Evangélicas de España | In Spanish | → Organizations and associations |
| FFRC | Fédération Française des Radios Chrétiennes | In French | → Organizations and associations → Telecommunications |
| FHGS | Franciscan Handmaids of the Good Shepherd | In English | → Roman catholic church |
| FJCT | Federatie Christelijk Jeugdwurk Tytsjerksteradiel | In Dutch | → Organizations and associations |
| FMC | Franciscan Missionaries of Saint Clare | In English | → Roman catholic church |
| FMM | Franciscan Missionaries of Mary | In English | → Roman catholic church |
| FRTC | Fédération des Radios et Télévisions Chrétiennes | In French | → Organizations and associations → Telecommunications |
| FSAS | Franciscan Sisters of All Saints | In English | → Roman catholic church |
| FSHA | Franciscan Sisters of Holy Annunciation | In English | → Roman catholic church |
| FSMA | Franciscan Sisters of Mary of Angels | In English | → Roman catholic church |
| FSSE | Franciscan Sisters of Saint Elizabeth | In English | → Roman catholic church |
| FSSH | Franciscan Sisters of Sacred Heart | In English | → Roman catholic church |
| FSSJ | Franciscan Sisters of Saint Joseph | In English | → Roman catholic church |
| GCSV | Groningse Christelijke Sport Vereniging | In Dutch | → Organizations and associations → Sport, physical exercises |
| GIRM | General Instruction of the Roman Missal | In English | → Roman catholic church |
| HCAC | Hindu-Christian Studies Academic Discussion List | In English | → Indian religions |
| HCSC | Helderse Christelijke Sport Centrale | In Dutch | → Organizations and associations → Sport, physical exercises |
| HM | Handmaids of Mary | In English | → Roman catholic church |
| HS | Hospitalar Sisters of Mercy | In English | → Roman catholic church |
| HSSC | Holy Spirit Study Centre | In English | |
| IABO | Internacia Asocio de Bibliistoj kaj Orientalismoj | In Esperanto | → Associations |
| IAPS | International Association of Patristics Studies = AIEP (look above) |
In English | → Associations → Archeology → Roman catholic church |
| ICAM | Institut Catholique d'Arts et Métiers | In French | → Roman catholic church → Specialized or (poly)technical colleges → Engineering, technology |
| ICF | International Christian Fellowship (www.icf.ch) | In English | |
| ICP | Institut Catholique de Paris | In French | → Roman catholic church → Education |
| ICP | Instituto Cristão de Pesquisas | In Portuguese | |
| ICT | Institut Catholique de Toulouse | In French | → Roman catholic church → Specialized or (poly)technical colleges |
| IDEO | Institut Dominicain d'Études Orientales du Caire | In French | → Research institutes → Roman catholic church → Area studies |
| IEEkQ | Institut zur Erforschung und Erschließung kirchlicher Quellen | In German | → Roman catholic church |
| IKUE | Internacia Katolika Unuigo Esperantista | In Esperanto | → Organizations and associations → Roman catholic church |
| IMS | Indian Missionary Society | In English | → Roman catholic church |
| INRI | Iesus Nazarenus Rex Iudaeorum | In Latin | |
| IOSCS | International Organization for Septuagint and Cognate Studies | In English | → Organizations and associations → Judaism |
| IURD | Igreja Universal do Reino de Deus = EURD, UCKG (look above) |
In Portuguese | → Modern spiritual movements |
| IURD | Iglesia Universal del Reino de Dios = EURD, UCKG (look above) |
In Spanish | → Modern spiritual movements |
| IVI | Invitation à la vie | In French | → Modern spiritual movements |
| JBL | Journal of Biblical Literature | In English | → Serial publications, periodicals → Literature |
| JPS | Jonge Protestanten die Samenwerken | In Dutch | → Organizations and associations → Protestant churches |
| JS | Josephine Sisters | In English | → Roman catholic church |
| KA | Kirkelig arbeidsgiver- og interesseorganisasjon | In Norwegian | → Organizations and associations → Labour, labour economics |
| KAAD | Katholischer Akademischer Ausländer-Dienst | In German | → Roman catholic church |
| KAÖ | Katholische Aktion Österreich | In German | → Organizations and associations → Roman catholic church |
| KELI | Kristana Esperantista Ligo Internacia | In Esperanto | → Organizations and associations |
| KKES | Kvakera Esperanto-Servo | In Esperanto | |
| KM | Kirchliche Monatschrift | In German | → Serial publications, periodicals |
| KOSC | Katholieke Ootmarsumer Sport Club | In Dutch | → Organizations and associations → Roman catholic church → Sport, physical exercises |
| KRVC | Katholieke Rijswijkse Voetbal Club | In Dutch | → Organizations and associations → Roman catholic church → Football and rugby |
| KSCV | Katholieke Sport Club Vasse | In Dutch | → Organizations and associations → Roman catholic church → Sport, physical exercises |
| KSH | Katholiek Sportleven Harreveld | In Dutch | → Organizations and associations → Roman catholic church → Sport, physical exercises |
| KSÖ | Katholische Sozialakademie Österreichs | In German | → Academies → Roman catholic church |
| KUL | Katolicki Uniwersytet Lubelski | In Polish | → Higher education, universities → Roman catholic church |
| KUL | Katholieke Universiteit Leuven | In Dutch | → Higher education, universities → Roman catholic church |
| KVVA | Katholieke Voetbal Vereniging Amersfoort | In Dutch | → Organizations and associations → Roman catholic church → Football and rugby |
| LAR | Little Apostles of Redemption | In English | → Roman catholic church |
| LB | Londona Biblio | In Esperanto | |
| LCGB | Lëtzebuerger Chrëschtleche Gewerkschaftsbond | In Letzeburgesh | → Organizations and associations → Labour, labour economics |
| LDFX | Little Daughters of Saint Francis Xavier | In English | → Roman catholic church |
| LDSJG | Little Daughters of Saint John Gaulbert | In English | → Roman catholic church |
| LSC | Little Sisters of Christ | In English | → Roman catholic church |
| LSDP | Little Sisters of Divine Providence | In English | → Roman catholic church |
| LSMS | Little Sisters of Mother of Sorrows | In English | → Roman catholic church |
| LWSH | Little Workers of the Sacred Hearts | In English | → Roman catholic church |
| MAC | Movimento Apostolico Ciechi | In Italian | → Organizations and associations |
| MC | Missionaries of Charity | In English | → Roman catholic church |
| MCBS | Missionary Congregation for the Blessed Sacrament | In English | |
| MCC | Maria Congregatie Club | In Dutch | → Organizations and associations → Sport, physical exercises |
| MEJ | Mouvement Eucharistique des Jeunes = MEJ | Movimiento Eucaristico Juvenil | In Spanish |
In French | → Organizations and associations |
| MEJ | Movimiento Eucaristico Juvenil = (look above) |
In Spanish | → Organizations and associations |
| MHA | Mormon History Association | In English | → Associations → History |
| MIDEO | Mélanges de l'Institut Dominicain des Études Orientales du Caire | In French | → Roman catholic church → Area studies |
| MLF | Missionaries of Little Flower | In English | → Roman catholic church |
| MMB | Malabar Missionary Brothers | In English | |
| MMI | Missionaries of Mary Immaculate | In English | → Roman catholic church |
| MMM | Missionaries of Mary Mediatrix | In English | → Roman catholic church |
| MMS | Medical Mission Sisters | In English | → Roman catholic church → Medicine |
| MPH | Methodist Publishing House (www.mph.org.uk) | In English | → Graphic industries, printing, publishing → Protestant churches |
| MS | Missionaries of Charity | In English | → Roman catholic church |
| MSA | Missionary Sisters of Ajmeer | In English | → Roman catholic church |
| MSI | Missionary Sisters of Immaculate | In English | → Roman catholic church |
| MSJ | Medical Sisters of Saint Joseph | In English | → Roman catholic church → Medicine |
| MSLC | Miscellanea di Studi di Letteratura Cristiana | In Italian | → Serial publications, periodicals → Linguistics |
| MSMI | Missionary Sisters of Mary Immaculate | In English | → Roman catholic church |
| NETS | New English Translation of the Septuagint | In English | → Judaism → Language, linguistics, literature |
| NL | Christelijk Nationaal Vakverbond | In Dutch | → Organizations and associations → Labour, labour economics |
| NS | Nazareth Sisters | In English | → Roman catholic church |
| NT | Novum Testamentum | In Latin | → Serial publications, periodicals |
| OCD | Order of Discalced Carmelites | In English | → Roman catholic church |
| OFM | Ordo Fratrum Minorum | In Latin | → Organizations and associations |
| OLG | (Sisters of) Our Lady of the Garden | In English | → Roman catholic church |
| OLP | (Sisters of) Our Lady of Providence | In English | → Roman catholic church |
| OMMI | Oblatas Misioneras de Maria Inmaculada = OMMI | Oblates Missionnaires de Marie Immaculée | In French = OMMI | Oblate Missionaries of Mary Immaculate | In English = OMMI | Oblate Missionarie di Maria Immacolata | In Italian |
In Spanish | → Roman catholic church |
| OMMI | Oblates Missionnaires de Marie Immaculée = (look above) |
In French | → Roman catholic church |
| OMMI | Oblate Missionarie di Maria Immacolata = (look above) |
In Italian | → Roman catholic church |
| OMMI | Oblate Missionaries of Mary Immaculate = (look above) |
In English | → Roman catholic church |
| OSA | Ordo Sancti Augustini | In Latin | → Organizations and associations |
| OSB | Ordo Sancti Benedicti | In Latin | → Organizations and associations |
| OSB | Order of Saint Benedict | In English | → Roman catholic church |
| OSC | Order of Saint Camillus | In English | → Roman catholic church |