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, but by 2018 the population had dropped to an estimated 3,477.

Lee County is a county located in the U.S. state of Arkansas. With its eastern border formed by the Mississippi River, it is considered to be part of the Arkansas Delta. As of the 2020 census, the population was 8,600. The county seat is Marianna.