Lutheranism is a major branch of Protestant Christianity that traces its origins to the theological reforms proposed by Martin Luther (1483-1546), a German Augustinian friar and professor of theology at the University of Wittenberg. The tradition formally emerged from the broader Reformation of the sixteenth century following Luther's challenge to doctrines and practices of the Roman Catholic Church, most notably his 1517 posting of the Ninety-Five Theses. Lutheranism is defined principally by the doctrines of sola scriptura (Scripture alone as the ultimate authority in matters of faith), sola fide (justification by faith alone), and sola gratia (salvation by grace alone). Today Lutheranism encompasses an estimated 80 million adherents worldwide, organized across numerous national and international church bodies, making it one of the largest Protestant denominations by membership.

Luther's break with Rome grew from his theological conclusion that the Catholic Church had departed from biblical teaching, particularly on the question of how sinners are made right before God. His doctrine of justification held that salvation is granted by God's grace through faith, not through meritorious works or ecclesiastical mediation. The Diet of Worms in 1521 resulted in Luther's excommunication and condemnation as an outlaw of the Holy Roman Empire, yet the movement continued to spread across German-speaking territories and into Scandinavia. The Augsburg Confession of 1530, drafted primarily by Philip Melanchthon, became the foundational confessional document of Lutheranism and remains authoritative across most Lutheran bodies. The Book of Concord (1580) later codified the full body of Lutheran confessional standards, including Luther's two catechisms and several additional documents.

Lutheran churches spread rapidly through Scandinavia, where they became established state churches in Denmark, Sweden, Norway, Finland, and Iceland. German Lutheranism produced significant internal tensions over confessional strictness in the centuries following Luther's death, and later waves of immigration carried Lutheranism into North America, Africa, and elsewhere. The modern landscape includes theologically conservative bodies, such as the Lutheran Church-Missouri Synod (LCMS) and the Wisconsin Evangelical Lutheran Synod (WELS), and more theologically progressive bodies, such as the Evangelical Lutheran Church in America (ELCA) and the Church of Sweden.

Lutheran theology is distinguished from other Protestant traditions by its sacramental theology, particularly its teaching on the Lord's Supper. Lutheranism affirms the Real Presence - that Christ's body and blood are truly present “in, with, and under” the bread and wine of communion - a position that distinguishes it from the memorialist view associated with Zwingli and the spiritual presence view associated with Calvin. Lutheran practice retains liturgical forms inherited from Catholic tradition while rejecting doctrines Lutherans regard as lacking scriptural warrant, including papal authority, purgatory, indulgences, and the sacrifice of the Mass.

The Lutheran confessional tradition distinguishes between Law (God's demands, which reveal sin) and Gospel (God's promise of grace), a distinction Lutheran theologians regard as central to correct biblical interpretation. Lutheran bodies differ on how strictly this and other confessional standards bind their clergy and congregations, with some requiring subscription to the entire Book of Concord and others treating it as a historical reference rather than a binding norm.

Contemporary Lutheranism is divided along theological and cultural lines. Questions of biblical authority, the ordination of women, and the blessing or performance of same-sex marriages have produced formal schisms and ongoing debate within and between Lutheran church bodies. The ELCA permits the ordination of openly gay and lesbian clergy and officiates same-sex marriages; the LCMS and WELS prohibit both. Several national Lutheran churches in Europe have adopted inclusive policies; others have not. The question of biblical authority underlies many of these disputes, with progressive bodies tending toward historical-critical interpretive frameworks and conservative bodies toward confessional or inerrancy positions.

Ecumenical relations are also contested. Some Lutheran bodies have entered into full communion agreements with Reformed, Episcopal, or Methodist churches; others regard such agreements as compromising confessional Lutheran identity.

There is broad historical-scholarly consensus on the basic facts of Lutheranism's origins, confessional documents, and institutional development. Theological claims internal to Lutheranism - such as the correctness of justification by faith alone or the nature of Christ's eucharistic presence - are matters of religious conviction rather than scholarly consensus and are addressed on viewpoint pages linked below.

• Confessional Lutheran - holds that the Book of Concord remains binding on Lutheran churches and that departure from its standards constitutes a departure from Lutheranism proper.
• Progressive Lutheran - holds that Lutheran confessional standards must be interpreted in light of contemporary scholarship and social context, and that doctrinal development on issues such as sexuality and gender is consistent with Lutheran principles.
• Ecumenical Lutheran - emphasizes convergence with other Christian traditions and supports formal communion agreements across denominational lines.
• Catholic - holds that Lutheranism represented a schismatic rupture from the legitimate authority of the Church and that Lutheran doctrines, particularly on justification and the sacraments, are deficient or erroneous.
• Reformed - holds that Lutheran sacramental theology, particularly the Real Presence doctrine, is mistaken, while affirming the shared Protestant commitments to Scripture and grace.

• Lutheranism - History
• Lutheranism - Real Presence Debate
• Lutheranism - Biblical Authority Debate
• Lutheranism - Sexuality and Ordination Debate
• The Reformation
• Protestantism
• Christianity
• Martin Luther
• Augsburg Confession
• Book of Concord

1. Braaten, Carl E. and Robert W. Jenson, eds. Christian Dogmatics. Fortress Press, 1984.
2. Kolb, Robert and Timothy J. Wengert, eds. The Book of Concord: The Confessions of the Evangelical Lutheran Church. Fortress Press, 2000.
3. Lohse, Bernhard. Martin Luther's Theology: Its Historical and Systematic Development. Fortress Press, 1999.
4. Lutheran World Federation. “Member Churches.” lwf.org. Accessed 2025.
5. Pelikan, Jaroslav. The Christian Tradition: Reformation of Church and Dogma (1300-1700). University of Chicago Press, 1984.
6. Wengert, Timothy J. Reading the Bible with Martin Luther. Baker Academic, 2013.