Public Citizen Litigation Group is the litigating arm of the non-profit consumer advocacy organization Public Citizen.  The Litigation Group's attorneys specialize in cases involving health and safety regulation, consumer rights, access to the courts, class actions, open government, and the First Amendment, including Internet free speech. Its lawyers testify before Congress and consult with public interest advocates on legislative and administrative matters within their areas of expertise. Since 1972, it has litigated cases at all levels of the federal and state judiciaries, including over 50 cases at the U.S. Supreme Court.

Its efforts are pursued through such programs as the Alan Morrison Supreme Court Assistance Project, the Consumer Justice Project, the Internet Free Speech Project, and the Freedom of Information Clearinghouse.