is a borough in Allegheny County, Pennsylvania on the west bank of the Monongahela river, eight miles (13 km) south of the confluence of the Monongahela and the Allegheny rivers where the Ohio river begins. It abuts Homestead, therefore it is possible to stand still with one foot being in Homestead and the other foot being in Munhall. A large part of the Homestead Works of the Carnegie Steel Company existed in Munhall. Steel products were the only items made in Munhall in 1910 when 5,185 people lived here. In 1940, 13,900 people lived in Munhall. The population was 12,264 at the 2000 census. Munhall, along with the boroughs of Homestead and West Homestead, are served by the Steel Valley School District.
According to the United States Census Bureau, the borough has a total area of 2.4 square miles (6.3 km²), of which, 2.3 square miles (6.0 km²) of it is land and 0.1 square miles (0.3 km²) of it (4.55%) is water.