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Online Computer Library Center

OCLC Online Computer Library Center, Inc. (OCLC) is "a nonprofit, membership, computer library service and research organization dedicated to the public purposes of furthering access to the world’s information and reducing information costs". Founded in 1967 as the Ohio College Library Center, OCLC and its member libraries cooperatively produce and maintain WorldCat, the largest online public access catalog (OPAC) in the world.

It was incorporated on July 6, 1967 as the not-for-profit Ohio College Library Center. More than 72,000 libraries in 170 countries and territories use OCLC services to locate, acquire, catalog, lend and preserve library materials. The organization was founded by Fred Kilgour, and its head office is located in Dublin, Ohio, U.S.

OCLC provides bibliographic, abstract and full-text information to anyone.

OCLC and its member libraries cooperatively produce and maintain WorldCat—the OCLC Online Union Catalog, the largest online public access catalog (OPAC) in the world. WorldCat has holding records from public and private libraries worldwide. The Open WorldCat program makes records of library-owned materials in OCLC's WorldCat database available to Web users on popular Internet search, bibliographic, and bookselling sites. In October 2005, the OCLC technical staff began a wiki project allowing readers to add commentary and structured-field information associated with any WorldCat record.