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Class Action Litigation

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Class action litigation is a procedure that lets one lawsuit resolve the claims of a large group of people who were harmed in a similar way by the same conduct. Instead of thousands of individuals each filing separately, a few named plaintiffs represent everyone in the group, called the class.

This tool is common when each person's individual loss is too small to justify a separate lawsuit, but the total harm across many people is significant. Typical examples include defective consumer products, misleading advertising, improper fees, data breaches, and certain employment or securities disputes.

Key concepts for a non-lawyer include class certification, the court's decision about whether a case can properly proceed as a group action; the role of the representative plaintiffs, who stand in for everyone else; and class notice, which informs absent members of their rights, including the right to opt out and pursue their own case. Class actions often end in a settlement that a judge must review and approve for fairness.

People may become involved simply by receiving a notice in the mail or by email. Someone who believes many others were harmed by the same practice, or who has questions about a notice they received, often consults a lawyer to understand whether to participate, object, or opt out.

Share of classified federal decisions

18851900192519501975200020076.3%0
share of classified federal decisions

Of the federal decisions we've classified by topic, the share each year that fall under this practice area — so a persistently high line means this is a large, enduring share of federal litigation. This is not a share of all litigation: only part of the corpus is topic-classified (unevenly across eras), and an opinion can belong to several areas, so areas need not sum to 100%. State cases are largely unclassified, so this is federal only. The dip in the last several years is a data-coverage gap — our corpus holds fewer opinions from the most recent years — not a real decline.

Circuit splits in class action litigation

Legal questions the federal courts of appeals are divided on — each links to the cases creating the split.

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Related practice areas

Consumer Fraud and Deceptive PracticesFair Credit Reporting LawFalse Advertising LawHealth Care LawIdentity Theft LawLegal Malpractice LawLemon LawMass Tort Law

Primary law

The governing U.S. Code, statutes and founding documents for Class Action Litigation.

Key definitions

Defined terms that recur in class action litigation — each links to its dictionary entry.

Class ActionPlaintiffCertificationSuperiorityCy PresNotice

Frequently asked questions

Class Action Litigation by state

Courts, law libraries and state-specific resources. State law governs much of this area, so deadlines and rules vary by state.

Further reading

  • Alberta's Judicial Leadership: A Biographical Account - Paperback
    Alberta's Judicial Leadership: A Biographical Account - Paperback
    Austin Mardon
  • New York Notary Public Exam Speed-Study Guide! - Paperback
    New York Notary Public Exam Speed-Study Guide! - Paperback
    Angelo Tropea
  • The Federalist: Excerpts with Commentary - Paperback
    The Federalist: Excerpts with Commentary - Paperback
    Roderick Saxey
  • Joint Operating Agreements: The Newspaper Preservation ACT and Its Application - Paperback
    Joint Operating Agreements: The Newspaper Preservation ACT and Its Application - Paperback
    John C. Busterna
  • Civil Procedure in Bulgaria - Paperback
    Civil Procedure in Bulgaria - Paperback
    Valentina Popova
  • State Constitutions and Criminal Justice - Hardcover
    State Constitutions and Criminal Justice - Hardcover
    Barry Latzer
  • Landmark Decisions of the United States Supreme Court VIII - Paperback
    Landmark Decisions of the United States Supreme Court VIII - Paperback
    Steve Gilbert
  • Trying Cases: Promise, Prove, Persuade: A manual for law students and young lawyers - Paperback
    Trying Cases: Promise, Prove, Persuade: A manual for law students and young lawyers - Paperback
    Jennifer Zedalis
  • Economic Law and Economic Growth: Antitrust, Regulation, and the American Growth System - Paperback
    Economic Law and Economic Growth: Antitrust, Regulation, and the American Growth System - Paperback
    George E. Garvey
  • An Analysis of the Principles of Equity Pleading: Containing a Compendium of the High Court of Chancery, and the Foundation of Its Rules, Together Wit - Hardcover
    An Analysis of the Principles of Equity Pleading: Containing a Compendium of the High Court of Chancery, and the Foundation of Its Rules, Together Wit - Hardcover
    Denis George Lubé
  • The Equal Rights Amendment: An Annotated Bibliography of the Issues, 1976-1985 - Hardcover
    The Equal Rights Amendment: An Annotated Bibliography of the Issues, 1976-1985 - Hardcover
    Renee Feinberg
  • Alaska Rules of Civil Procedure: Complete Rules and Commentary as Revised through May 15, 2020 - Paperback
    Alaska Rules of Civil Procedure: Complete Rules and Commentary as Revised through May 15, 2020 - Paperback
    Peter Edwards Esq
  • A Remonstrance: Addressed to the Right Honorable Lord Brougham on the Injustice and Impolicy of the Proposed Bill for the Abolition of - Hardcover
    A Remonstrance: Addressed to the Right Honorable Lord Brougham on the Injustice and Impolicy of the Proposed Bill for the Abolition of - Hardcover
    John Huxtable Elliott
  • Securities Arbitration for Brokers, Attorneys, and Investors - Hardcover
    Securities Arbitration for Brokers, Attorneys, and Investors - Hardcover
    J. Kirkland Grant
  • Modern Communications Law - Hardcover
    Modern Communications Law - Hardcover
    Donald Lively
  • Managing Real Estate Taxes - Hardcover
    Managing Real Estate Taxes - Hardcover
    Jerry T. Ferguson
  • Regulation and the Courts: The Case of the Clean Air Act - Paperback
    Regulation and the Courts: The Case of the Clean Air Act - Paperback
    R. Shep Melnick
  • Microcomputers as Decision AIDS in Law Practice - Hardcover
    Microcomputers as Decision AIDS in Law Practice - Hardcover
    Stuart S. Nagel
  • The Constitutional System: The Group Character of Elected Institutions - Hardcover
    The Constitutional System: The Group Character of Elected Institutions - Hardcover
    Henry J. Merry
  • Reflections on 30 Years of the Asian Development Bank Administrative Tribunal - Paperback
    Reflections on 30 Years of the Asian Development Bank Administrative Tribunal - Paperback
    Asian Development Bank
  • Nameless Persons: Legal Discrimination Against Non-Marital Children in the United States - Hardcover
    Nameless Persons: Legal Discrimination Against Non-Marital Children in the United States - Hardcover
    Martha T. Zingo
  • Law in American Meetinghouses: Church Discipline and Civil Authority in Kentucky, 1780-1845 - Hardcover
    Law in American Meetinghouses: Church Discipline and Civil Authority in Kentucky, 1780-1845 - Hardcover
    Jeffrey Thomas Perry
  • Neighbors and Strangers: Law and Community in Early Connecticut - Paperback
    Neighbors and Strangers: Law and Community in Early Connecticut - Paperback
    Bruce H. Mann
  • The Essential Holmes: Selections from the Letters, Speeches, Judicial Opinions, and Other Writings of Oliver Wendell Holmes, Jr. - Paperback
    The Essential Holmes: Selections from the Letters, Speeches, Judicial Opinions, and Other Writings of Oliver Wendell Holmes, Jr. - Paperback
    Oliver Wendell Holmes

This overview is general legal information, not legal advice, and does not create an attorney–client relationship. Laws vary by state and change over time — consult a licensed attorney about your situation.