The Joint Declaration on the Doctrine of Justification (JDDJ) is a document created and agreed to by the Catholic Church's Pontifical Council for Promoting Christian Unity (PCPCU) and the Lutheran World Federation in 1999 as a result of Catholic–Lutheran dialogue. It states that the churches now share "a common understanding of our justification by God's grace through faith in Christ." To the parties involved, this essentially resolves the 500-year-old conflict over the nature of justification which was at the root of the Protestant Reformation. The World Methodist Council adopted the Declaration on 18 July 2006. The World Communion of Reformed Churches, adopted the Declaration in 2017.

The Lutheran World Federation is a global communion of national and regional Lutheran denominations headquartered in the Ecumenical Centre in Geneva, Switzerland. The federation was founded in the Swedish city of Lund in 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.