The Provisional Congress of the Confederate States, also known as the Provisional Congress of the Confederate States of America, convenes in Montgomery, Alabama on February 4, 1861. As many as 30,000 Irish-born fight on the Confederate side during the American Civil War including Chaplain John B. Bannon. A number of Irish rise to senior leadership in the Confederate army including Patrick Cleburne and Henry Strong. Strong is killed at the Battle of Antietam while on the opposite Union side on that awful day, 540 members of the Irish Brigade are killed.

The Provisional Congress of the Confederate States is a congress of deputies and delegates called together from the Southern States which become the governing body of the Provisional Government of the Confederate States from February 4, 1861 to February 17, 1862. It sits in Montgomery until May 21, 1861, when it adjourns to meet in Richmond, Virginia, on July 20, 1861. It adds new members as other states secede from the Union and directs the election on November 6, 1861, at which a permanent government is elected.

The First Session of the Provisional Congress is held at Montgomery from February 4, 1861, to March 16, 1861. On February 8, the Convention adopts the Provisional Constitution of the Confederate States, and so becomes the first session of the Provisional Confederate Congress. Members are present from Alabama, Florida, Georgia, Louisiana, Mississippi, South Carolina, and Texas. It drafts the provisional constitution and sets up a government. For president and vice president, it selects Jefferson Davis of Mississippi and Alexander H. Stephens of Georgia.

The Second Session of the Provisional Congress is held at Montgomery from April 29, 1861, to May 21, 1861. It includes the members of the First Session with the additions of Virginia and Arkansas. John Tyler, the tenth president of the United States (1841–1845), serves as a delegate from Virginia in the Provisional Confederate States Congress until his death in 1862.

North Carolina and Tennessee join the Third Session of the Provisional Congress which is held at Richmond from July 20, 1861, to August 31, 1861. Membership remains unchanged for the Fourth Session on September 3, 1861.

The Fifth Session of the Provisional Congress is held at Richmond from November 18, 1861, to February 17, 1862. All previous members are present with the additions of Missouri and Kentucky. One non-voting member is present from the Arizona Territory.