The St. Marks River State Park is a state park in Tallahassee, Florida. It is the 161st state park in Florida, and being relatively new, it is still relatively undeveloped and not a lot of information is available about it online.

The St. Marks River State Park was created to protect St. Marks River from the impending development that is threatening to engulf it. The state acquired 2589 acres of land that contains several natural communities in the area to protect the habitats and preserve the water quality.

Mostly the activities available on the St. Marks River State Park are hiking and mountain biking. Plans to develop the park are still under works, especially since the development was impeded by the financial crash of 2007.