Mississippian

Mississippian may refer to:
 * Mississippian (geology), a subperiod of the Carboniferous period in the geologic timescale, roughly 360 to 325 million years ago
 * Mississippian culture, a culture of Native American mound-builders from 900 to 1500 AD
 * Mississippian Railway, a short line railroad
 * A native of Mississippi