An interreligious organization or interfaith organization is an organization that encourages dialogue and cooperation between the world's different religions. In 1893, the Parliament of the Worlds Religions held, in conjunction with the World Colombian Exposition, a conference held in Chicago that is believed to be the first interfaith gathering of notable significance. In the century since, many local, national and international organizations have been founded.

• American Jewish Committee (AJC) Dept of Interreligious Affairs, established 1906
• Berkley Center for Religion, Peace, and World Affairs at Georgetown University
• Center for Jewish-Christian Understanding and Cooperation (CJCUC), established 2008
• Council for a Parliament of the World’s Religions, established 1988
• Elijah Interfaith Institute, established 1997
• European Council of Religious Leaders, established 2002
• Fellowship of Reconciliation (FOR), established 1914
• Focolare Movement
• GreenFaith, an environmental organization established in 1992
• Institute for Interreligious Dialogue
• The Inter Faith Network
• International Fellowship of Reconciliation
• Interfaith Alliance
• Interfaith Center for Sustainable Development
• Interfaith Center on Corporate Responsibility
• Interfaith Dialog Center
• Interfaith Drug Policy Initiative
• Interfaith Encounter Association
• Interfaith Institute of Divine Love
• Interfaith Leadership Council of Metropolitan Detroit
• Interfaith Medical Center
• Interfaith Nutrition Network
• Interfaith Worker Justice
• International Association for Religious Freedom
• International Council of Christians and Jews
• International Humanist and Ethical Union
• Interreligious and International Federation for World Peace
• International Association for Religious Freedom (IARF), established 1900
• International Council of Christians and Jews (ICCJ), established 1975
• International Humanist and Ethical Union, world body for Humanism that promotes comparative religion and interreligious dialogue
• KAICIID Dialogue Centre, established in 2012
• Lutheran World Federation Program on Interfaith and Peace
• Malaysian Consultative Council of Buddhism, Christianity, Hinduism, Sikhism and Taoism
• Muslim-Jewish Advisory Council
• Network of Spiritual Progressives
• North American Interfaith Network
• Project Interfaith
• Pontifical Council for Interreligious Dialogue, established 1964
• The Religious Institute on Sexual Morality, Justice, and Healing
• Tanenbaum Center for Interreligious Understanding
• Temple of Understanding (ToU), established 1960
• United Religions Initiative (URI), established 2000
• The World Conference of Religions for Peace, established 1970
• World Council of Churches Team on Interreligious Relations, established 1948
• World Interfaith Harmony Week

• Comité Pro Paz (Chile), 1973–1975; supported human rights during the Pinochet regime
• The Interfaith Alliance (US), established 1994
• Interfaith Center of New York
• Interfaith Partners of South Carolina (US), established 2010
• Interfaith Housing Center of the Northern Suburbs
• Malaysian Consultative Council of Buddhism, Christianity, Hinduism, Sikhism and Taoism, established 1983
• Network of Spiritual Progressives, established 2006
• Muslim-Jewish Advisory Council, established 2016
• Interfaith Families Project of Greater Washington, D.C., established in 1995

Some governmental institutions are geared specifically with dealing with diversity of religions.

• Australasian Police Multicultural Advisory Bureau

• Interfaith dialogue