(a)
(1) 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 as a party if:
(A) in that person's absence, the court cannot accord complete relief among existing parties; or
(B) that person claims an interest relating to the subject of the action and is so situated that disposing of the action in the person's absence may:
(i) as a practical matter impair or impede the person's ability to protect the interest; or
(ii) leave an existing party subject to a substantial risk of incurring double, multiple, or otherwise inconsistent obligations because of the interest.
(2) Joinder by Court Order. If a person has not been joined as required, the court must order that the person be made a party. A person who refuses to join as a plaintiff may be made either a defendant or, in a proper case, an involuntary plaintiff.
(3) Venue. If a joined party objects to venue and the joinder would make venue improper, the court must dismiss that party.
(b)
(1) the extent to which a judgment rendered in the person's absence might prejudice that person or the existing parties;
(2) the extent to which any prejudice could be lessened or avoided by:
(A) protective provisions in the judgment;
(B) shaping the relief; or
(C) other measures;
(3) whether a judgment rendered in the person's absence would be adequate; and
(4) whether the plaintiff would have an adequate remedy if the action were dismissed for nonjoinder.
(c)
(1) the name, if known, of any person who is required to be joined if feasible but is not joined; and
(2) the reasons for not joining that person.
(d)
Notes of Advisory Committee on Rules—1937
Note to Subdivision (a). The first sentence with verbal differences (e.g., "united" interest for "joint" interest) is to be found in [former] Equity Rule 37 (Parties Generally—Intervention). Such compulsory joinder provisions are common. Compare Alaska Comp. Laws (1933) §3392 (containing in same sentence a "class suit" provision); Wyo.Rev.Stat.Ann. (Courtright, 1931) §89–515 (immediately followed by "class suit" provisions, §89–516). See also [former] Equity Rule 42 (Joint and Several Demands). For example of a proper case for involuntary plaintiff, see Independent Wireless Telegraph Co. v. Radio Corp. of America, 269 U.S. 459 (1926).
The joinder provisions of this rule are subject to Rule 82 (Jurisdiction and Venue Unaffected).
Note to Subdivision (b). For the substance of this rule see [former] Equity Rule 39 (Absence of Persons Who Would be Proper Parties) and U.S.C., Title 28, §111 [now 1391] (When part of several defendants cannot be served); Camp v. Gress, 250 U.S. 308 (1919). See also the second and third sentences of [former] Equity Rule 37 (Parties Generally—Intervention).
Note to Subdivision (c). For the substance of this rule see the fourth subdivision of [former] Equity Rule 25 (Bill of Complaint—Contents).
Notes of Advisory Committee on Rules—1966 Amendment
Notes of Advisory Committee on Rules—1987 Amendment
The amendments are technical. No substantive change is intended.
Committee Notes on Rules—2007 Amendment
The language of Rule 19 has been amended as part of the general restyling of the Civil Rules to make them more easily understood and to make style and terminology consistent throughout the rules. These changes are intended to be stylistic only.
Former Rule 19(b) described the conclusion that an action should be dismissed for inability to join a Rule 19(a) party by carrying forward traditional terminology: "the absent person being thus regarded as indispensable." "Indispensable" was used only to express a conclusion reached by applying the tests of Rule 19(b). It has been discarded as redundant.
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