The Law Library of the Free University of Berlin holds almost 800,000 books, journals and other media on all areas of law from all continents. It may be considered as one of the largest legal collections in Germany. It covers titles in the areas of Civil Law, Criminal Law, Constituional and Public Law, International Law, Conflict of Laws, European Union Law and Foreign Law.

Attached to the main reading hall there are reading rooms on Labor Law, Environmental Law, Economic Law, Tax Law, Social Service Law, Legal Theory and Legal Sociology as well as on German and Roman Legal History. Special focus is also given to the areas of European and German Anti-Trust and Regulation Law, Criminology, Private Insurance Law and Accounting Law. The Law Library has been renovated between 2009 and 2011 and, since then, it incorporates former law libraries in other buildings of the Freie Universität Berlin.

The Library supports with its wide range of electronic and print literature the full spectrum of legal courses and research at the Law School as well as interdisciplinary projects of the Freie Universität Berlin.

Part of the Law Library is the Wilhelm Wengler Library of International and Comparative Law which used to be the largest and best equipped library on international law in all of Germany. Due to its special books on the Law of Asia, Africa and Latin America, many visitors from overseas join students and teachers for research in Dahlem. Todays classes especially on Anglo-American, European and International law are covered, to a great deal, by licensed international databases. There are special introducions for international students, researchers and university teachers, especially for the university chair on US-american law.