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Appellate Law

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Appellate law is the practice of asking a higher court to review a decision made by a lower court. An appeal is not a new trial; it is a focused review of whether the lower court applied the law correctly and followed proper procedures.

Appeals can arise from many kinds of cases, including civil disputes and other matters decided by a trial court or, in some situations, an agency. The appealing party argues that an error affected the outcome, while the other side defends the decision. Appellate work centers heavily on written briefs and the record from the lower court, sometimes followed by oral argument before a panel of judges.

Key concepts a non-lawyer should understand include the idea that appellate courts generally do not hear new evidence or new witnesses; that they review the existing record for legal error; and that they tend to give some deference to a trial court's factual findings while reviewing legal questions more closely. Appeals are also governed by strict deadlines and procedural rules, and possible outcomes include affirming, reversing, or sending a case back for further proceedings.

People typically consult an appellate lawyer when they believe a significant legal error affected the result of their case, or when they must defend a favorable decision that the other side is appealing. Appellate work often calls for skills distinct from trial practice.

Share of classified federal decisions

1861187519001925195019752000200795%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 appellate

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

From the OpenJurist Bookshop

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Related practice areas

Criminal Appeals LawCivil Litigation DefenseAlternative Dispute ResolutionAntitrust and Trade Regulation LawBusiness and Corporate LitigationClass Action Litigation

Primary law

The governing U.S. Code, statutes and founding documents for Appellate Law.

Key definitions

Defined terms that recur in appellate law — each links to its dictionary entry.

AppealAppellantJurisdictionBriefAppelleeWrit Of CertiorariRemandAffirmReverseDe NovoStandingMootness

Key cases of the U.S. Courts of Appeals and the Supreme Court of the United States

The most-cited decisions applying U.S. Code Title 28 (Judiciary and Judicial Procedure) — beyond the landmark cases above.

Frequently asked questions

Appellate Law 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

  • Federal Rules of Appellate Procedure; 2018 Edition - Paperback
    Federal Rules of Appellate Procedure; 2018 Edition - Paperback
    Michigan Legal Publishing Ltd
  • Federal Rules of Appellate Procedure; 2022 Edition: With Appendix of Length Limits and Official Forms - Paperback
    Federal Rules of Appellate Procedure; 2022 Edition: With Appendix of Length Limits and Official Forms - Paperback
    Michigan Legal Publishing Ltd
  • Appellate Courts and Lawyers: Information Gathering in the Adversary System - Hardcover
    Appellate Courts and Lawyers: Information Gathering in the Adversary System - Hardcover
    Thomas Marvell
  • Suggested Changes in the State's Appellate Judicial System. - Paperback
    Suggested Changes in the State's Appellate Judicial System. - Paperback
    E. A. McCulloch
  • Rule Haiku: Federal Rules of Appellate Procedure - Hardcover
    Rule Haiku: Federal Rules of Appellate Procedure - Hardcover
    Levi Jones
  • Shakespeare Legally Speaking: The Law in Shakespeare's Plays - Hardcover
    Shakespeare Legally Speaking: The Law in Shakespeare's Plays - Hardcover
    Thomas W. Thrash
  • Appellate Courts in the United States and England - Hardcover
    Appellate Courts in the United States and England - Hardcover
    Delmar Karlen
  • Avoiding a Trucking Nightmare: What You Need to Know After a Truck-related Injury - Paperback
    Avoiding a Trucking Nightmare: What You Need to Know After a Truck-related Injury - Paperback
    Patrick Cummings
  • Appellate Courts in the United States and England - Hardcover
    Appellate Courts in the United States and England - Hardcover
    Delmar Karlen
  • Judging on a Collegial Court: Influences on Federal Appellate Decision Making - Hardcover
    Judging on a Collegial Court: Influences on Federal Appellate Decision Making - Hardcover
    Virginia A. Hettinger
  • Reports of the Decisions of the Appellate Courts of the State of Illinois; Volume XI - Paperback
    Reports of the Decisions of the Appellate Courts of the State of Illinois; Volume XI - Paperback
    James B. Bradwell
  • Federal Rules of Appellate Procedure; 2024 Edition: With Appendix of Length Limits and Official Forms - Paperback
    Federal Rules of Appellate Procedure; 2024 Edition: With Appendix of Length Limits and Official Forms - Paperback
    Michigan Legal Publishing Ltd
  • Federal Rules of Appellate Procedure; 2025 Edition: With Appendix of Length Limits and Official Forms - Paperback
    Federal Rules of Appellate Procedure; 2025 Edition: With Appendix of Length Limits and Official Forms - Paperback
    Michigan Legal Publishing Ltd
  • North Carolina Appellate Law: A Guide to the North Carolina Appellate Rules - Paperback
    North Carolina Appellate Law: A Guide to the North Carolina Appellate Rules - Paperback
    Pamela Newell Williams
  • Federal Rules of Appellate Procedure; 2019 Edition: With Appendix of Length Limits and Official Forms - Paperback
    Federal Rules of Appellate Procedure; 2019 Edition: With Appendix of Length Limits and Official Forms - Paperback
    Michigan Legal Publishing Ltd

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.