Rossmoyne is a census-designated place (CDP) in Sycamore Township, Hamilton County, Ohio, United States, 13 miles (21 km) northeast of downtown Cincinnati.

[4] Rossmoyne is bordered by Deer Park to the south, Dillonvale to the west, Blue Ash to the north, and Kenwood to the east.

According to the United States Census Bureau, the CDP has a total area of 0.58 square miles (1.5 km2), all land.

The racial makeup of the CDP was 78.2% White, 9.3% Black or African American, 0.4% Native American, 2.2% Asian, 0.6% Pacific Islander, 2.0% from some other race, and 7.2% from two or more races.

41.2% of all households were made up of individuals, and 16.1% were someone living alone who was 65 years of age or older.