Carnegie is a borough in Allegheny County, Pennsylvania, United States and is part of the Pittsburgh Metro Area. The population was 7,972 at the 2010 census.
Carnegie is located at 40°24′25″N 80°5′12″W / 40.40694°N 80.08667°W / 40.40694; -80.08667. It is approximately 5 miles (8 km) southwest of Pittsburgh. Chartiers Creek runs through the center of the borough.
According to the United States Census Bureau, the borough has a total area of 1.6 square miles (4.1 km2), all of it land. Its average elevation is 833 ft (254 m) above sea level.