On Monday, June 30, 2025, the Library of Congress will launch its new online catalog platform.
PLEASE NOTE: Online requesting is now disabled through June 30th as part of this transition. For more information, please visit the Catalog Welcome Page.

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Welcome to LC Catalog

Contains over 20 million catalog records for books, serials, manuscripts, maps, music, recordings, images, and electronic resources in the Library of Congress collections.

  • Browse Find titles, authors/creators, subjects, call numbers, or standard numbers in alphabetical or sequential lists, with cross-references.
  • Advanced Search Combine search words using guided menus.
  • Keyword Search Find search words anywhere in the catalog record. Includes Keyword (Expert) search.
  • Ask a Librarian
    Email a question to an LC subject specialist
  • Research Centers
    Explore Library reading room services and operations
  • FAQs for Research
    Find answers to common questions from Library patrons
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    Learn how to obtain an LC reader identification card

Additional Catalogs & Research Tools

The LC Catalog is the main access point for the Library's collections. Click on the links below to use specialized catalogs and tools for additional LC resources:

  • Archival Finding Aids
    Guides to unique Library of Congress archival collections
  • Copyright Office Catalog
    U.S. Copyright registrations and ownership documents, 1978-present
  • Handbook of Latin American Studies
    Annotated bibliography of scholarly works on Latin America
  • NLS Catalog
    National Library Service for the Blind and Print Disabled braille and talking books
  • Prints and Photographs Online Catalog
    Prints & Photographs Division holdings, including over 1 million digital images
  • Thesauri & Controlled Vocabularies
    Controlled search terms with a full network of cross-references. Includes LC Subject Headings.
  • LC Authorities
    Headings and cross references for subjects, names, titles, and name/title combinations
  • E-Resources Online Catalog
    Subscription and free databases, ejournals, and ebooks accessible at the Library
  • LC Linked Data Service
    Commonly found standards and vocabularies promulgated by the Library of Congress (id.loc.gov)
  • Primo
    Single search for articles and ebooks in selected subscription and free resources available at LC
  • Sound Online Inventory and Catalog (SONIC)
    Broadcast and archival recordings, including 78s, 45s, and Copyright tapes
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