Amicus Curiae Brief
A document submitted by a non-party to a court case offering information or expertise relevant to the case to assist in decision-making.
Updated April 23, 2026
How It Works in Practice
An amicus curiae brief, Latin for "friend of the court," is submitted by individuals or organizations that are not directly involved in a court case but have a strong interest in its outcome. These briefs provide additional perspectives, expertise, or information to help judges understand the broader implications of a case beyond the arguments presented by the actual parties. For example, advocacy groups, government entities, or experts might submit such briefs to highlight how a ruling could affect public policy, social issues, or legal precedents.
The process for submitting an amicus brief typically requires permission from the court or consent from the parties involved. Courts often consider these briefs when cases involve complex issues or have wide-reaching effects. While amicus briefs cannot introduce new evidence, they can offer legal reasoning, policy considerations, or technical details that might otherwise be overlooked.
Why It Matters
Amicus curiae briefs play a critical role in shaping judicial decisions, especially in high-profile or constitutional cases. They help courts see beyond the immediate dispute and consider broader societal, economic, or political consequences. This is particularly important in diplomacy and political science, where court rulings can influence government policies, international relations, and civil rights.
By providing expert analysis or representing the interests of groups unable to participate directly, these briefs enrich the court's understanding and promote more informed, balanced decisions. They also serve as a tool for advocacy groups and governments to influence legal outcomes without being a party to the litigation.
Amicus Curiae Brief vs. Party Brief
A common confusion is between an amicus curiae brief and the briefs filed by the actual parties in a case. Party briefs are submitted by plaintiffs or defendants and focus on arguing their specific positions and facts. In contrast, amicus briefs come from third parties who do not have a direct stake but seek to inform the court about broader implications or specialized knowledge.
Unlike party briefs, amicus briefs must remain neutral regarding the parties’ claims and cannot introduce new factual evidence. Their value lies in providing additional context or highlighting public interest concerns.
Real-World Examples
One notable example is the numerous amicus briefs filed in the U.S. Supreme Court case Obergefell v. Hodges (2015), which legalized same-sex marriage nationwide. Various advocacy groups, religious organizations, and government entities submitted amicus briefs presenting arguments about civil rights, social policy, and constitutional interpretation.
Another example includes international organizations submitting amicus briefs in cases that affect international law or diplomatic relations, helping courts understand the global ramifications of their rulings.
Common Misconceptions
A frequent misconception is that amicus curiae briefs can sway a court’s decision unfairly or that they are only submitted by interest groups. In reality, courts critically evaluate these briefs, and not all are accepted or influential. Additionally, amici include a wide range of contributors like academics, government agencies, and professional associations, not just advocacy groups.
Another misunderstanding is that amicus briefs can introduce new evidence. Courts generally restrict these briefs to legal arguments and policy perspectives without new factual claims.
Overall, amicus curiae briefs are a vital mechanism for ensuring courts consider diverse viewpoints and the wider impact of their decisions.
Example
In the landmark Brown v. Board of Education case, numerous civil rights organizations submitted amicus curiae briefs to support desegregation efforts.