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Aspinwall is a largely residential borough on the Allegheny River in Allegheny County, Pennsylvania, within the Pittsburgh metropolitan area.

Aspinwall began as a planned community: Henry Warner formed the Aspinwall Land Company in 1890 after buying 155 acres from Annie Aspinwall, and mostly upper-middle-class Pittsburghers bought the 60 home sites.

By 1890 the new town already had 400 residents, mostly young couples with children, and 40 of them petitioned to separate from O'Hara Township, leading to Aspinwall's incorporation as a borough on December 28, 1892.

Aspinwall takes its name from the Aspinwall family, the landowners whose property the community was built on.

Aspinwall developed in three phases between 1893 and 1905, expanding again in 1905 when the Aspinwall-Delafield Company's 200 acres were annexed to the borough.

Aspinwall's population climbed from 1,231 in 1900 to a peak of 4,716 in 1940, and it was 2,916 at the 2020 census.

Aspinwall had 1,499 households at the 2000 census, all packed into a borough of only about 0.4 square miles.

Aspinwall is home to the Sauer Buildings Historic District on Center Avenue, an eccentric, castle-like complex of nine buildings that architect Frederick C. Sauer built by hand between 1898 and 1942, now listed on the National Register of Historic Places.

Aspinwall students attend the Fox Chapel Area School District, every one of whose schools has been named a National Blue Ribbon School.

Aspinwall is bordered by Sharpsburg to the west and O'Hara Township on its other land sides, with Pittsburgh's Highland Park neighborhood across the Allegheny River.