The Old Courthouse, Warren County, also known as Warren County Courthouse, stands prominently on a hill in Vicksburg, Mississippi, and was a symbol of Confederate resistance during the Siege of Vicksburg. It was designated a National Historic Landmark in 1968 and a Mississippi Landmark in 1986. The landmarked area comprises the entire Courthouse Square, which includes the courthouse and four attached buildings that were originally cistern houses for catching rainwater to fight fires, but these were later converted into offices.