Hemlock Bluffs Nature Preserve is a joint project between the North Carolina state park system and the Town of Cary in Wake County, North Carolina in the United States. Located in Cary, it covers approximately 140-acre in the Research Triangle region of the state. The state owns 97-acre of the preserve, known as Hemlock Bluffs State Natural Area. The Town of Cary owns approximately 42-acre of the preserve, and the town leases the state's land for management.