Spring Mills is an unincorporated community and census-designated place (CDP) in Centre County, Pennsylvania, United States.

It is part of the State College, Pennsylvania Metropolitan Statistical Area.

[1] Spring Mills is located in southeastern Centre County, near the center of Gregg Township.

According to the United States Census Bureau, the CDP has a total area of 0.44 square miles (1.15 km2), all land.

20.2% of households were made up of individuals, and 10.1% were one person aged 65 or older.