Haysville is a borough in Allegheny County, Pennsylvania, United States, along the Ohio River.

The population was 81 according to the 2020 census,[3] making it the least-populous municipality (out of 130) in Allegheny County.

Haysville has three land borders with Aleppo Township to the north, Glenfield to the east and Glen Osborne to the west.

Across the Ohio River to the south, Haysville runs adjacent with Coraopolis and Neville Township.

There were 9.5% of families and 17.3% of the population living below the poverty line, including 23.1% of under eighteens and 12.5% of those over 64.