Aliquippa is a city in Beaver County, Pennsylvania, United States, within the Pittsburgh metropolitan area.
Formerly a borough, it was formally named a city in 1987 by the Aliquippa Council.

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Aliquippa was founded by the merger of three towns: Aliquippa, Woodlawn, and New Sheffield. There is no evidence connecting the Seneca Queen Alliquippa with the location of the borough. This was one of several Indian names selected arbitrarily by the Pittsburgh and Lake Erie Railroad in 1878 for stations along the route. Aliquippa is best known as the location of a productive steel mill that the Jones and Laughlin Steel Company constructed there along the Ohio River beginning in 1905. Employment at the facility sustained a population of 27,023 in 1940. P&LE Station

The mill closed during the collapse of the steel industry during the 1980s. This major economic loss alongside suburbanization caused a major population loss through the end of the 20th century. The oldest church without the current boundaries of Aliquippa is Mt. Carmel Presbyterian Church (formerly White Oak Flats Presbyterian Church), established about 1793 in the New Sheffield region on Brodhead Road. Many of the city's businesses have left since the closing of the mill. This has left the area economically depressed.

The B.F. Jones Memorial Library is a proud historical landmark of the community.

As of the census of 2000, there were 11,734 people, 5,124 households, and 3,176 families residing in the city. The population density was 2,867.7 people per square mile. There were 5,843 housing units at an average density of 1,428.0 per square mile.

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