The Battle of Pine Bluff, also known as the Action at Pine Bluff, was an engagement fought on October 25, 1863 in Jefferson County, Arkansas during the American Civil War. The Post of Pine Bluff, a United States garrison commanded by Colonel Powell Clayton, successfully defended the town against attacks led by Confederate Brigadier-General John S. Marmaduke's cavalry division. Much of the fighting took place near Jefferson Courthouse, which the Confederates tried unsuccessfully to set ablaze. The Union victory ensured Pine Bluff was occupied by U.S. forces until the end of the war.

After the capture of Little Rock on September 10, 1863, Union forces occupied several towns along the Arkansas. Confederate Brigadier-General John S. Marmaduke, commanding a cavalry division, decided to test their strength at Pine Bluff. On Sunday, October 25, Marmaduke attacked the Post of Pine Bluff, a U.S. garrison commanded by Colonel Powell Clayton of the 5th Kansas Cavalry.

At 8 a.m., Marmaduke's 2,000 Confederate cavalry approached Pine Bluff from three sides. The 550 Federal cavalrymen and Missouri militia, supported by 300 freedmen, barricaded the courthouse square with cotton-bales and positioned the cannon to command the adjacent streets. Marmaduke's Division made several attacks upon the square, then attempted to set the county courthouse on fire. They were unsuccessful and withdrew to Princeton, Arkansas.

• List of American Civil War battles
• Troop engagements of the American Civil War, 1863

• Christ, Mark K. (October 19, 2016). "Action at Pine Bluff". Encyclopedia of Arkansas. Little Rock: CALS. Retrieved September 3, 2021.
• Christ, Mark K. (2010). "Chapter 7: "The Federals Fought Like Devils": The Battle of Pine Bluff". In Urwin, Gregory J. W. (ed.). Civil War Arkansas, 1863: The Battle for a State. Campaigns & Commanders. Vol. 23. Norman: University of Oklahoma Press. pp. 224–244. ISBN 978-0-8061-4087-2. LCCN 2009017622. OCLC 320352031. OL 23218465M.
• Watts, J. Carter (n.d.). Battle of Pine Bluff, October 25, 1863. Pine Bluff: Jefferson County Historical Museum.

• Media related to Battle of Pine Bluff at Wikimedia Commons
• Battle of Pine Bluff at the Historical Marker Database