Fed. R. Civ. P. 19 — Required Joinder of Parties
Last verified: May 19, 2026 · U.S. Courts — FRCP.
Rule Text — Key Provisions
(a) Required party. A person who is subject to service of process and whose joinder will not deprive the court of subject-matter jurisdiction must be joined if: (A) the court cannot accord complete relief among existing parties; or (B) the absent person claims an interest relating to the subject and may be impaired as a practical matter, or risks double or inconsistent obligations.
(b) When joinder is not feasible. If a required party cannot be joined, court must determine in equity and good conscience whether to proceed without them or dismiss. Four factors: (1) prejudice to absent person; (2) ability to lessen prejudice through court order; (3) adequacy of judgment without that person; (4) plaintiff’s remedy if dismissed.
Full text: law.cornell.edu/rules/frcp/rule_19.
Plain English
Rule 19 is the “compulsory joinder” rule. Some people must be parties to your case because: (a) you can’t get full relief without them, or (b) they have an interest that will be hurt if the case proceeds. If they can’t be joined — say, because joining them would defeat federal diversity jurisdiction — the court has to decide whether to proceed without them or dismiss entirely.
Key Cases & Authority
- Provident Tradesmens Bank & Trust Co. v. Patterson, 390 U.S. 102 (1968) — Foundational analysis of “indispensability” under what is now Rule 19(b). Courts consider equity and good conscience.
- Republic of the Philippines v. Pimentel, 553 U.S. 851 (2008) — Sovereign immunity-based reasons for non-joinder weigh heavily under 19(b); courts cannot ignore the absent party’s claim of immunity.
- Davis v. United States, 192 F.3d 951 (10th Cir. 1999) — Common application: tribes claiming sovereign immunity are required parties, often resulting in dismissal under 19(b).
Florida Parallel
Fla. R. Civ. P. 1.210 covers parties generally. Florida’s required-joinder analysis tracks federal Rule 19 closely.
About this rule walkthrough
Part of The Federal Rule Book, hosted by John M. Phillips — Board Certified Civil Trial Lawyer, Court TV analyst, admitted in 8 states + 9 federal districts + SCOTUS.
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Educational only — not legal advice.
Rule Text (verbatim from the Florida Supreme Court)
(a) A person who is subject to service of process and whose joinder will not deprive the court of subject-matter jurisdiction must be joined if: (A) in that person’s absence the court cannot accord complete relief among existing parties; or (B) the absent person claims an interest relating to the subject and may be impaired as a practical matter, or risks double or inconsistent obligations.
(b) If a required party cannot be joined, court must determine in equity and good conscience whether the action should proceed or should be dismissed. Four factors: prejudice to absent person; ability to lessen prejudice; adequacy of judgment without that person; plaintiff’s remedy if dismissed.
Educational reference. This page summarizes a Federal Rule of Civil Procedure for educational purposes. It is not legal advice. Federal procedural rules can change — always verify the current text at uscourts.gov before relying on this summary in any case.
What this rule means in plain English
Rule 19 is the compulsory-joinder rule. Some people must be parties because you cannot get full relief without them or their interest will be hurt. If they cannot be joined — sovereign immunity, diversity destruction — the court has to decide whether to proceed without them or dismiss entirely under Rule 19(b)’s four-factor analysis.