Look up Mississippian in Wiktionary, the free dictionary.

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