The Federal Rules of Civil Procedure (officially abbreviated Fed. R. Civ. P.; colloquially FRCP) govern civil procedure in United States district courts. The FRCP are promulgated by the United States Supreme Court pursuant to the Rules Enabling Act, and then the United States Congress has seven months to veto the rules promulgated or they become part of the FRCP. The Court's modifications to the rules are usually based upon recommendations from the Judicial Conference of the United States, the federal judiciary's internal policy-making body.

Although federal courts are required to apply the substantive law of the states as rules of decision in cases where state law is in question, the federal courts almost always use the FRCP as their rules of civil procedure. States may determine their own rules, which apply in state courts, although 35 of the 50 states have adopted rules that are based on the FRCP.