The Lutheran World Federation is a global communion of national and regional Lutheran churches headquartered in the Ecumenical Centre in Geneva, Switzerland. The federation was founded in the Swedish city of Lundin the aftermath of the Second World War in 1947 to coordinate the activities of the many differing Lutheran churches. Since 1984, the member churches are in pulpit and altar fellowship, with common doctrine as the basis of membership and mission activity.

The LWF now has 145 member church bodies in 89 countries representing over 74 million Lutherans. The LWF acts on behalf of its member churches in areas of common interest such as ecumenical and interfaith relations, theology, humanitarian assistance, human rights, communication, and the various aspects of mission and development work.

The Department for World Service is the LWF's humanitarian and development arm. It has programmes in 24 countries and is the UNHCR 9th largest implementing partner. The LWF is a member of ACT Alliance.