Cherry trees in bloom in front of Jerome Greene Hall

Arthur W. Diamond Law Library

One of the finest collections of legal materials in the nation—at your service.

The Law Library's Cellar level is currently closed to patrons. You may request Cellar-located items for pick up via their records in our online catalog, Pegasus, or by asking at the Circulation Desk. Items are typically ready for pick up at the Circulation Desk within one business day.
We thank you for your cooperation and patience during this time!

The Arthur W. Diamond Law Library, named after Arthur W. Diamond (Class of 1926), located in Jerome Greene Hall, is home to one of the most comprehensive print and digital legal collections in the country. In addition to a comprehensive U.S. law collection, it also has strong collections in international, foreign, and comparative law and a special section devoted to Japanese law.

Print Collection

  • 440,000+ titles from 184 countries in 149 languages
  • Largest collection of Japanese law materials at a U.S. university
  • 200,000+ titles covering foreign and comparative law
  • 60,000+ titles covering public and private international law
  • 550,000+ volumes located offsite and accessible in 24 hours
  • 30,000 volumes and 1,500 linear feet of papers and manuscripts in Special Collections
  • Students can browse almost all the books located onsite, both in the Law Library and in other Columbia University Libraries.

Electronic Collection

  • 100,000+ titles, covering U.S., foreign, and international law
  • Extensive collection of legal electronic databases (U.S., foreign, and international)
  • Access to the entire Columbia University database collection

Reference Librarians

All Reference Librarians have law degrees and graduate library science degrees and are available seven days a week for help with:

  • Legal research
  • Research planning
  • Source gathering
  • Online databases
  • Internet searches
  • Interlibrary loans from institutions across the world