Rosemary Beach is an unincorporated planned community in Walton County, Florida, United States on a beach side road, CR 30A, on the Gulf Coast. Rosemary Beach is developed on land originally part of the older Inlet Beach neighborhood. The town was founded in 1995 by Patrick D. Bienvenue, President of Leucadia Financial Corporation, and was designed by Duany Plater-Zyberk& Company.