Aspinwall is a borough on the Allegheny River in Allegheny County, Pennsylvania, United States. It is part of the Pittsburgh metropolitan area. The population was 2,916 at the 2020 census.

The Allegheny River is a 325-mile-long (523 km) headwater stream of the Ohio River that is located in western Pennsylvania and New York in the United States. It runs from its headwaters just below the middle of Pennsylvania's northern border, northwesterly into New York, then in a zigzag southwesterly across the border and through Western Pennsylvania to join the Monongahela River at the Forks of the Ohio at Point State Park in Downtown Pittsburgh, Pennsylvania.