Mound Key Archaeological State Park is a historically and archaeologically significant island located at Estero Bay in the state of Florida.

Only accessible by boat, Mound key is best visited during the summer season as the tides are favorable for visitors during those months. The Mound Key Archeological State Park spans the entire island of Mound Key. There are interpretative displays located on the main trail the spans the width of the island which are used for self-guided tours. There are no other facilities on the island so any park visitor should be prepared with basic rations such as water, sunblock, insect repellant, and snacks.

Mound Key is riddled with archaeologically significant structures like Mounds that were once part of the Calusa Nation culture and territory.