Pentagon Library

Current Pentagon Library facility hours

Pentagon Library, located in PLC2: Tuesday - Thursday from 0800 - 1600 and by appointment.

  • Please place books you wish to borrow on hold via the library catalog. When the item is available you will be notified.

Mark Center Annex: Will remain closed at this time.

For more information regarding the Pentagon Library hours, please email:

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The Pentagon Library serves the information needs of offices of the Secretary of Defense, Joint Chiefs of Staff, and Military Departments located at the Pentagon.

The Library traces its history back to 1800, when the War Department Library was established. In 1944, the Secretary of War issued a memorandum setting up the Pentagon Library to serve those working in the new office building. The library collection includes historical documents acquired throughout its long history.

As a business library supporting Department of Defense decision-makers and policy-makers, the print and online collections focus on:

              • Military
              • Law and Legislation
              • Government
              • History
              • International Affairs
              • Management and Leadership

Pentagon Library Hours and Locations