The Historic Langhorne Association, established in 1965, is headquartered in an 1888 building that formerly housed the Langhorne Library. Its goal is to research, record, renovate, and preserve the history of Langhorne, Bucks County, Pennsylvania. The Association offers a research library, a museum of local artifacts, and a collection of archival materials.

Historic Langhorne's archival holdings encompass over 55 linear feet of materials, dating primarily from the mid-19th century to the late-20th century. They include house histories for Langhorne properties, subject files, photographs and postcards, maps and blueprints, family papers, genealogy files, organizational records, the records of local fraternal organizations, newspaper clippings, obituaries, deeds, tax assessments, and other research materials.