The Law Library operates as the laboratory for the College of Law, housing materials that are used to support the academic program of the College and the research interests of Law faculty and students. Numbering over 230,000 volumes and volume equivalents, the collection has primary materials, in the form of statutes and court reporters, for the federal system and all 50 states. Secondary materials, consisting of treatises, law reviews, and looseleaf services, round out the American law collection. There is also a working collection of UK and Canadian primary and secondary materials, and a growing International Law collection. The Law Library is also a Selective Federal Government Documents depository.

A host of electronic databses are accessible from the Law Library website. College of Law faculty, staff, and students have individual access to the Lexis and Westlaw databases. In addition, the Law Library subscribes to many other legal and non-legal databases such as Congressional Universe, HeinOnline, LegalTrac, Loislaw, and BNA publications. The Idaho State Bar also provides law students with free access to the Casemaker web library.

Special collections include records and briefs submitted to the Idaho Supreme Court and Court of Appeals, and the Clagett Collection, which consists of materials collected by Fred and Dorothy Clagett to support their research on the life and times of William H. Clagett, the president of Idaho's Constitutional Convention in 1889.