Half Moon is a census-designated place (CDP) in Onslow County, North Carolina, United States.

It is part of the Jacksonville, North Carolina Metropolitan Statistical Area.

According to the United States Census Bureau, the CDP has a total area of 4.3 square miles (11 km2), all land.

As of the 2020 United States census, there were 7,543 people, 2,769 households, and 2,027 families residing in the CDP.

14.0% of all households were made up of individuals, and 2.2% had someone living alone who was 65 years of age or older.