The National Lawyers Guild (NLG) is a progressive public interest association of lawyers, law students, paralegals, jailhouse lawyers, law collective members, and other activist legal workers, in the United States. The group was founded in 1937 as an alternative to the American Bar Association (ABA) in protest of that organization's exclusionary membership practices and conservative political orientation. They were the first predominantly white US bar association to allow the admission of minorities to their ranks. The group sought to bring more lawyers closer to the labor movement and progressive political activities, to support and encourage lawyers otherwise "isolated and discouraged," and to help create a "united front" against Fascism.

The American Bar Association (ABA) is a voluntary bar association of lawyers and law students; it is not specific to any jurisdiction in the United States. Founded in 1878, the ABA's stated activities are the setting of academic standards for law schools, and the formulation of model ethical codes related to the legal profession. As of fiscal year 2017, the ABA had 194,000 dues-paying members, constituting approximately 14.4% of American attorneys. In 1979, half of all lawyers in the U.S. were members of the ABA. The organization's national headquarters are in Chicago, Illinois, and it also maintains a significant branch office in Washington, D.C.