Millheim is a borough in Centre County, Pennsylvania, United States. It is part of the State College, Pennsylvania Metropolitan Statistical Area. The population was 749 at the 2000 census.
Millheim is located at 40°53′28″N 77°28′33″W / 40.89111°N 77.47583°W / 40.89111; -77.47583 (40.890981, -77.475954).
According to the United States Census Bureau, the borough has a total area of 1.3 square miles (3.4 km²), all of it land.