Moraine is a city in Montgomery County, Ohio, United States. The population was 6,307 at the 2010 census. The city is part of the The Dayton Metropolitan Statistical Area, which includes Montgomery county. Moraine, as part of the Dayton area, is situated within the Miami Valley region of Ohio, just north of the Cincinnati metropolitan area. The city is also home to the outdoor waterpark Splash Moraine.
Moraine is located at 39°41′44″N 84°13′40″W / 39.69556°N 84.22778°W / 39.69556; -84.22778 (39.695650, -84.227677).
According to the United States Census Bureau, the city has a total area of 9.3 square miles (24.2 km²), of which, 9.1 square miles (23.5 km²) of it is land and 0.3 square miles (0.7 km²) of it (2.89%) is water.