Marianna is a town in and the county seat of Lee County, Arkansas, United States. As of the 2010 census it had a population of 4,115, and by 2018 the population had dropped to an estimated 3,477.
Located along the L'Anguille River in the Arkansas Delta just north of the St. Francis National Forest, the community was known as "Walnut Ridge" until 1852 when it became known as "Marianna". The town's economy has historically been based on agriculture, especially cotton production. The town is located along Crowley's Ridge Parkway and the Great River Road, both National Scenic Byways showcasing Crowley's Ridge and the Mississippi River.
The community was established by Col. Walter H. Otey in 1848, and was known as Walnut Ridge until 1852.
Marianna is located in the center of the county at the northwest tip of St. Francis National Forest. U.S. Route 79 passes through the north and west sides of the town, leading northeast 58 miles (93 km) to Memphis, Tennessee, and southwest 90 miles (140 km) to Pine Bluff.