Liberty is a borough in Allegheny County, Pennsylvania, United States.

Liberty is part of the South Allegheny School District, along with Glassport, Lincoln, and Port Vue, and is home to the district's high school and early childhood center.

[4] It is bounded by Port Vue and McKeesport to the north, Versailles and the Youghiogheny River to the east, Lincoln to the south, and Glassport to the west.

Liberty Borough is served by the South Allegheny School District.

28.5% of all households were made up of individuals, and 16.1% had someone living alone who was 65 years of age or older.