Confessional Lutheranism is a name used by Lutherans to designate those who accept the doctrines taught in the Book of Concord of 1580 (the Lutheran confessional documents) in their entirety because (quia) they are completely faithful to the teachings of the Bible. While most Lutheran denominations find the basis of their faith in the Book of Concord, Confessional Lutherans maintain that faithfulness to it requires attention to how that faith is actually being preached, taught, and put into practice. Confessional Lutherans believe that this is a vital part of their identity as Lutherans.
While the term Confessional Lutheran is generally used among the more conservative churches found in groupings such as the International Lutheran Council and the Confessional Evangelical Lutheran Conference. Churches of the larger Lutheran World Federation subscribe to the Book of Concord as an exposition of faith, in so far as (quatenus) it agrees with their interpretation of the Bible.
Two main confessional movements arose during the 19th century: the Old Lutherans and the Neo-Lutherans. The Old Lutherans originated from the Schism of the Old Lutherans, while Neo-Lutheranism arose in Germany in the 1830s from the Pietist driven Erweckung, or Awakening. Neo-Lutheranism itself contained differing camps. It gave rise later to those calling themselves confessional Lutherans.
Neo-Lutheranism developed in reaction to Pietism on the one side and Rationalism on the other, both of which had arisen in the previous century. German clergymen like Martin Stephan, C.F.W. Walther, F.C.D. Wyneken and Wilhelm Loehe became a part of the movement as they studied the works of Martin Luther and the Book of Concord.