The American Philatelic Research Library (APRL) is a major resource for people interested in stamps and postal history. Described as one of the largest philatelic libraries in the world, it supports members of the American Philatelic Society with access to research materials and practical reference services. Its offerings include loans by mail and scanning services, helping users consult philatelic resources beyond the library itself.

The APRL also maintains specialized research tools, including the David Straight Memorial Philatelic Union Catalog and the Robert A. Mason Digital Library. These resources help collectors and researchers locate literature and information relevant to their interests. The library’s services sit within a broader community devoted to learning, collecting, and sharing knowledge about philately. Related resources include a philatelic literature review, stamp identification information, and guidance for collectors at different stages of the hobby. Through its collections, services, and digital resources, the APRL helps preserve and make philatelic knowledge more accessible to APS members and the wider collecting community.