The Marks' Mills State Park is a state park and historic site in Fordyce, Arkansas. It features and conserves the Marks? Mills Battlefield.

The Battle of Marks? Mills is an American Civil War event that took place in April 25, 1864. At this point, the Confederate Cavalry ambushed and captured a Union supply train and its escort brigade. This event forced General Frederick Steele to abandon Camden and retreat to Little Rock because they do not have ample supplies anymore. This makes the Marks' Mills State Park a part of the Camden Expedition commemorated by the Camden Expedition Sites National Historic Landmark.

The Marks' Mills State Park is also a part of the Red River Campaign National Historic Landmark. It is also known as the Marks' Mills Battleground State Park.