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. The town is approximately 105 acres (0.42 km2) and, upon completion, included more than 400 home sites and a mixed-use town center with shops, restaurants, and activities.

Walton County is located on the Emerald Coast in the northwestern part of the U.S. state of Florida, with its southern border on the Gulf of Mexico. As of the 2020 census, the population was 75,305. Its county seat is DeFuniak Springs. The county is home to the highest natural point in Florida: Britton Hill, at 345 feet (105 m). Walton County is included in the Crestview–Fort Walton Beach–Destin Metropolitan Statistical Area.