The Augsburg Interim is the general term given to an imperial decree ordered on May 15, 1548, at the 1548 Diet of Augsburg, after Charles V, Holy Roman Emperor, had defeated the forces of the Schmalkaldic League in the Schmalkaldic War of 1546/47.

Maurice, the Duke (and later, Elector) of Albertine Saxony, invaded the lands of his rival and stepbrother in Ernestine Saxony, John Frederick, beginning the brief, but devastating, conflict known as the Schmalkaldic War. The military might of Maurice combined with that of Charles V proved to be overwhelming to John Frederick and the Schmalkaldic League. On April 24, 1547 the armies of the Schmalkaldic League were decisively defeated at the Battle of Mühlberg.

Following the defeat of the Schmalkaldic League at Mühlberg, Charles V's forces took and occupied the Lutheran territories in quick succession. On May 19, 1547 Wittenberg, the heart of the Reformation, and final resting place of Martin Luther's remains, fell to the Emperor without a fight.

Charles V had won a military victory, but realised that the only chance he had to effectively contain Lutheranism as a movement was to pursue political and ecclesiastical compromises in order to restore religious peace in the Reich. The series of decrees issued by the Emperor became known as an "Interim" because they were only intended to govern the church temporarily pending the conclusions of the general council convened at Trent by pope Paul III in December 1545. Included in the provisions of the Interim was that the Lutherans restore the number of sacraments (which the Lutherans reduced to three - Baptism, the Lord's Supper, and Absolution). That the churches restore a number of specifically Roman ceremonies, doctrines, and practises which had been discarded by the Lutheran reformers, including also transubstantiation, and the rejection of the doctrine of justification by grace, through faith alone. The God-given authority of the pope over all bishops and the whole Church was reaffirmed, but with the proviso that "the powers that he has should be used not to destroy but to uplift". In stark contrast to Charles V's past attitude, significant concessions were made to the Protestants. What was basically a new code of religious practises permitted both clerical marriage and communion under both kinds. While the Mass was reintroduced, the offertory was to be seen as an act of remembrance and thanks, rather than an act of propitiation as in traditional Catholic dogma. The Interim went further in making significant statements on other matters of dogma such as justification by faith, the veneration of the saints, and the authority of the Scriptures. Even such details as the practise of fasting was breached upon. This attempt by the emperor to device a formula to which both Catholics and Protestants of Germany could subscribe was objected to outright by the Catholic Electors, the prince-bishops and the pope even before the decree was published.

Therefore, as a decree, the Interim applied only to the Protestants princes, who were given just 18 days to signify their compliance. Despite the fact that Philip Melanchthon, friend of Luther and co-architect and voice of the Reformation movement, was willing to compromise these issues for the sake of peace, the Augsburg Interim was rejected by a significant number of Lutheran pastors and theologians. Pastors who refused to follow the regulations of the Augsburg Interim were removed from office and banished; some were imprisoned and some were even executed. In Swabia and along the Rhine River, some four hundred pastors went to prison rather than agree to the Interim. They were exiled, and some of their families were killed or dies as a result…Some preachers left for England.