803.01.Parties plaintiff and defendant; capacity.
Ch. 803: Parties · Last amended 2009 · Last verified July 15, 2026
Full Text of Section 803.01
Plain-English Summary
No Wisconsin action gets dismissed just because it was not brought in the real party in interest’s name until a reasonable time has been given, after an objection, for that party to ratify the case, join it, or be substituted in; once that happens, the case is treated as if it had been commenced in the real party’s name from the start. A range of representatives, including a personal representative, guardian, bailee, trustee of an express trust, someone who contracted in their own name for another’s benefit, or a party a statute authorizes, may sue in their own name without joining the person the recovery ultimately benefits, and a partner asserting a partnership claim may sue alone as long as the pleading notes it is a partnership claim.
Minors and people who are alleged or adjudicated incompetent must appear through an attorney, a guardian of the estate, or a guardian ad litem. A guardian ad litem is required whenever there is no guardian of the estate, the guardian will not appear and act, or the guardian’s interests conflict with the ward’s, though an attorney of record already representing the minor or incompetent person is generally appointed guardian ad litem instead, absent good cause shown on the record.
The section spells out who applies for that appointment and where: the circuit court where the action is or will be pending, with a circuit court commissioner handling paternity actions. A minor plaintiff 14 or older, or a competent adult, can apply directly; for a younger minor or an incompetent party, the application can come from a guardian, relative, friend, or the state. If the appointment happens before the action begins, the petition is titled in the name of the proposed action, and the appointment can precede service of the summons. Finally, if a court later discovers that a minor or incompetent party went through the case unrepresented, all further proceedings stop until a guardian ad litem is appointed, and a judgment entered without proper representation can be vacated on motion, within one year after the disability is removed for the person themselves, or within one year after death for their personal representative.
Frequently Asked Questions
Can my Wisconsin case be dismissed because I sued in the wrong party’s name?
Not immediately. Section 803.01(1) requires the court to allow a reasonable time after objection for ratification, joinder, or substitution of the real party in interest before dismissing on that ground.
Can a trustee sue in their own name instead of naming the trust beneficiary?
Yes. A trustee of an express trust, along with personal representatives, guardians, bailees, and statutorily authorized parties, may sue in their own name without joining the person for whose benefit the action is brought.
When is a guardian ad litem required for a minor party in Wisconsin?
When the minor has no guardian of the estate, when the guardian fails to appear and act on the minor’s behalf, or when the guardian’s interests are adverse to the minor’s.
Can a minor apply for their own guardian ad litem?
A minor plaintiff 14 years of age or older may apply themselves; for a younger minor, the guardian, a relative, a friend, or the state may apply instead.
What happens to a judgment entered against a minor who was never properly represented?
Section 803.01(3)(c) lets the minor move to vacate the judgment within one year after the disability is removed, or lets the personal representative do so within one year after the minor’s death.
Amendment History
History: Sup. Ct. Order, 67 Wis. 2d 585, 638 (1975); 1975 c. 218; 1977 c. 299, 449; 1981 c. 317; 1993 a. 481; 1997 a. 35; 2001 a. 61, 102; 2005 a. 387; 2005 a. 443 s. 265; 2009 a. 276.