Joint Declaration on the Doctrine of Justification

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 substantially resolves much of the 500-year-old conflict over the nature of justification which was at the root of the Protestant Reformation.

As of 2017, the bodies representing 75% of the world's Christians have formally affirmed the Joint Declaration. Now as a five-way agreement between the Roman Catholic Church, the Lutheran World Federation, the World Methodist Council, the Anglican Communion, and the World Communion of Reformed Churches, it is, however, not without controversy.