The Carnegie Free Library of Allegheny is situated in the Allegheny Center neighborhood of Pittsburgh, Pennsylvania. It was commissioned in 1886, the first Carnegie library to be commissioned in the United States. Donated to the public by entrepreneur Andrew Carnegie, it was built from 1886 to 1890 on a design by John L. Smithmeyer and Paul J. Pelz.

Allegheny Center is a neighborhood on Pittsburgh's North Side. Its zip code is 15212, and it has representation on Pittsburgh City Council by both council members for District 6 and District 1 (Northside).