The Weeden Island Cultures are a group of related archaeological cultures that existed during the Late Woodland period of the North American Southeast. The name for this group of cultures was derived from the Weedon Island site (despite the dissimilar spellings) in Old Tampa Bay in Pinellas County.
Weeden Island cultures are defined by ceramics, which fall into two categories, sometimes called secular and sacred. Sacred ceramics are found primarily in mounds, while secular ceramics are found primarily in middens and house sites. The two types of ceramics have separate histories, and the secular ceramics show considerable variation between regions. Milanich, et al. compare the Weeden Island sacred complex to the Hopewell and Mississippian complexes, i.e., a ceremonial complex practiced by several cultures.
Scholars believe that the secular components of Weeden Island cultures emerged from the Swift Creek culture during the Middle Woodland Period (ca. 200 - 500 CE) in the lower Chattahoochee-Apalachicola river drainage, where Alabama, Florida and Georgia meet. To the east of this Weeden Island heartland, Weeden Island secular components developed out of the Deptford culture, from which the Swift Creek culture had also developed. The sacred or ceremonial component of Weeden Island developed out of the Hopewell tradition-based Yent and Green Point traditions. It persisted in some areas until the end of the Woodland period ca. 1200. Weeden Island sites have been found from Mobile Bay to the Okefenokee Swamp, and from south of Tampa Bay to the fall line on the Chattahoochee River at Columbus, Georgia.