| ACC | Anglican Consultative Council |
| ACC | Anglican Church of Canada |
| ACNA | Anglican Church in North America |
| ACO | Anglican Communion Office |
| AIC | African Initiated Churches |
| ALERC | Anglican-Lutheran European Regional Commission |
| ALIC | Anglican Lutheran International Commission |
| ALICC | Anglican-Lutheran International Coordinating Committee |
| ALJWG | Anglican-Lutheran Joint Working Group |
| AME | African Methodist Episcopal |
| AMEZ | African Methodist Episcopal Zion |
| AOJDC | Anglican-Orthodox Joint Doctrinal Commission |
| ARC-USA | Anglican-Roman Catholic Consultation in the United States |
| BCP | Book of Common Prayer (Anglican/Episcopal) |
| BEM | Baptism, Eucharist and Ministry (1982) |
| BoD | Book of Discipline (United Methodist) |
| CADEIO | Catholic Association of Diocesan Ecumenical and Interreligious Officers |
| CCC | Catechism of the Catholic Church |
| CCM | Called to Common Mission |
| CCT | Christian Churches Together |
| CCUN | Church Center for the United Nations |
| CFO | Commission on Faith and Order |
| CICARWS | Commission on Inter-church Aid, Refugee and World Services |
| CME | Christian Methodist Episcopal |
| CMEP | Churches for Middle East Peace |
| CoB | Council of Bishops |
| COCU | Consultation on Church Union |
| CSWCC | Conference of Secretaries of World Christian Communions |
| CUiC | Churches Uniting in Christ |
| CWA | Churchwide Assembly (ELCA) |
| CWS | Church World Service |
| DEIO | Diocesan Ecumenical and Interreligious Officer |
| EAD | Ecumenical Advocacy Days |
| ECOSOC | Economic and Social Council (United Nations) |
| ECUSA | Episcopal Church in the United States of America |
| EDEIO | Episcopal Diocesan Ecumenical and Interreligious Officers |
| EIR | Ecumenical and Interreligious Relations |
| ELCA | Evangelical Lutheran Church in America |
| ELCiC | Evangelical Lutheran Church in Canada |
| EUB | Evangelical United Brethren |
| GA | General Assembly (Presbyterian) |
| GC | General Convention (Episcopal) |
| GC | General Conference (United Methodist) |
| GEII | Graymoor Ecumenical and Interreligious Institute |
| HoB | House of Bishops |
| IARCCUM | International Anglican-Roman Catholic Commission for Unity and Mission |
| IASCUFO | Inter-Anglican Standing Commission on Unity Faith and Order |
| ICCC | International Council of Community Churches |
| ICRC | International Conference of Reformed Churches |
| IER | Institute for Ecumenical Research (Strasbourg) |
| IKZ | Internationale Kirchliche Zeitschrift |
| ILC | International Lutheran Council |
| JDDJ | Joint Declaration on the Doctrine of Justification (1999) |
| JES | Journal of Ecumenical Studies |
| JLRCSC | Joint Lutheran-Roman Catholic Study Commission |
| JOOCC | Joint Orthodox-Old Catholic Commission |
| JPC | Justice, Peace and Creation |
| LARC | Lutheran, Anglican, Roman Catholic |
| LARCUM | Lutheran, Anglican, Roman Catholic, United Methodist |
| LBW | Lutheran Book of Worship |
| LCF | Leuenberg Church Fellowship |
| LCMS | Lutheran Church–Missouri Synod |
| LECC | Lutheran-Episcopal Coordinating Committee |
| LEIRN | Lutheran Ecumenical and Inter-Religious Representatives Network |
| LMCC | Lutheran-Moravian Coordinating Committee |
| LRCUSA | Lutheran-Roman Catholic Dialogue in the United States |
| LWF | Lutheran World Federation |
| MECC | Moravian-Episcopal Coordinating Committee |
| MRCJC | Methodist-Roman Catholic Joint Commission |
| NAAE | North American Academy of Ecumenists |
| NAE | National Association of Evangelicals |
| NALC | North American Lutheran Church |
| NAPARC | North American Presbyterian and Reformed Council |
| NCC | National Council of Churches |
| NCCCUSA | National Council of the Churches of Christ in the United States of America |
| NEOA | National Ecumenical Officers Association |
| NIFCON | Network on Interfaith Concerns (Anglican) |
| NPC | National Planning Committee (of the National Workshop) |
| NRPE | National Religious Partnership for the Environment |
| NWCU | National Workshop on Christian Unity |
| OAIC | Organization of African Instituted Churches |
| OCA | Orthodox Church in America |
| OCUIR | Office of Christian Unity and Interreligious Relationships (United Methodist) |
| OGA | Office of the General Assembly (Presbyterian) |
| PCA | Presbyterian Church in America |
| PCID | Pontifical Council for Interreligious Dialogue |
| PCPCU | Pontifical Council for Promoting Christian Unity |
| PCS | Porvoo Common Statement |
| PCUSA | Presbyterian Church (U.S.A.) |
| PECUSA | Protestant Episcopal Church in the United States of America |
| PWR | Parliament of the World’s Religions |
| RCA | Reformed Church in America |
| RfP | Religions for Peace |
| SBC | Southern Baptist Convention |
| SCEIR | Standing Commission on Ecumenical and Interreligious Relations (Episcopal) |
| SEIA | Secretariat for Ecumenical and Interreligious Affairs (Roman Catholic) |
| SODEPAX | Society, Development, and Peace (RC and WCC Joint Committee) |
| TCTCV | The Church: Towards a Common Vision (2013) |
| TEC | The Episcopal Church |
| TUMC | The United Methodist Church |
| UCC | United Church of Christ |
| UFO | Unity Faith and Order |
| UMC | United Methodist Church |
| UMEIT | United Methodist Ecumenical and Interreligious Training |
| UNCSW | United Nations Commission on the Status of Women |
| UNHCR | United Nations High Commissioner for Refugees |
| USCCB | United States Conference of Catholic Bishops |
| WCC | World Council of Churches |
| WCRC | World Communion of Reformed Churches |
| WEA | World Evangelical Alliance |
| WMC | World Methodist Council |
| WPCU | Week of Prayer for Christian Unity |
| WRF | World Reformed Fellowship |