Glossary card
Amicus brief
Definition
An amicus brief is a filing by a non-party, often called a friend of the court, offering extra legal or practical context.
Why it matters
Amicus briefs can show how a ruling may affect governments, industries, scholars, advocacy groups, or other stakeholders.
In practice
Amicus filings often cluster around merits briefing and can shape the practical record the justices see beyond the parties' narrower dispute.
Track who filed, which side they support, and whether the brief supplies institutional, technical, or historical context.
Common confusion
Amici do not become parties to the case. Their filings support or oppose positions, but the parties still control the dispute.
Live examples
No published examples yet.