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Glossary

Amicus curiae

friend of the court

common-lawcivil-law

A non-party permitted to file submissions because it has a legitimate interest in the outcome.

In more detail

Amicus briefs are most influential in constitutional and appellate litigation, where a court benefits from expertise or wider consequences that the parties may not present. Permission requirements differ: US federal appellate courts accept them routinely, while many civil-law systems admit them only through specialised procedures.

Related terms

  • intervener
  • public-interest-litigation

See how this applies to you

Definitions are general. How a term operates depends on the jurisdiction you are in.