The Plaintiff: Who Files a Lawsuit
The plaintiff is the party who initiates a civil lawsuit by filing a complaint with the court. In a lawsuit, the plaintiff is the party claiming to have been harmed and seeking a remedy -- typically monetary damages or injunctive relief. There can be multiple plaintiffs in a single case, as in a class action where thousands of plaintiffs' claims are consolidated.
To be a plaintiff, a person must have 'standing' -- a legal concept requiring that the plaintiff has suffered an actual injury, that the injury is traceable to the defendant's conduct, and that the court can remedy the injury. Abstract or hypothetical harm is generally insufficient to establish standing.
The Defendant: Who Is Sued
The defendant is the party against whom the lawsuit is brought. Defendants include individuals, corporations, government entities, and other legal entities. A lawsuit can name multiple defendants -- for example, a trucking accident case might name the driver, the trucking company, and the vehicle owner as separate defendants with different theories of liability.
Being a defendant does not mean one is guilty or liable -- it means a plaintiff has made allegations that must be addressed through the legal process. Defendants have full rights to contest allegations, present evidence, and require the plaintiff to prove their case.
Other Parties in Litigation
Beyond plaintiffs and defendants, litigation involves other participants. Third-party defendants are entities brought into the case by defendants who claim contribution or indemnification rights. Intervenors are parties with a legal interest in the litigation who join the case even though they weren't originally named. In class actions, absent class members are people whose interests are represented by named plaintiffs but who didn't individually file suit.
Counterclaimants are defendants who file their own claims against plaintiffs (or others) within the same lawsuit. Cross-claimants assert claims against co-parties (other defendants or co-plaintiffs). The web of parties in complex commercial litigation can include dozens of entities with varying legal relationships.
Legal Standing: Who Can Sue
Not everyone with an interest in a legal outcome has standing to sue. Article III of the Constitution (for federal courts) requires injury in fact, causation, and redressability. State courts have parallel standing doctrines. In class actions, the named plaintiffs must personally have standing -- they cannot sue on behalf of a group based solely on that group's harm without themselves having been harmed.
Associational standing allows organizations to sue on behalf of their members in some circumstances. Government agencies can sue as plaintiffs to enforce public laws. This creates a broad array of potential plaintiffs beyond just individuals who suffered direct personal harm. Related: how to bring a class action lawsuit.
Class Members: Participating Without Being Named
In class action lawsuits, most affected individuals participate as unnamed (absent) class members. These individuals are bound by the outcome of the litigation -- including any settlement -- even though they didn't individually file claims. Class members can typically opt out of a class action and pursue their own individual claims, but most choose to remain in the class.
Receiving a class action settlement notice means you are identified as a potential class member. Responding to the notice by submitting a claim form is typically all that is required to receive your share of any settlement fund.
How to Get Legal Help
If you believe you qualify based on the eligibility criteria described above, the next step is a free consultation with an experienced attorney. Most plaintiff-side attorneys handling these cases work on contingency -- meaning you pay nothing unless your case results in a recovery. Bring any relevant documentation including receipts, correspondence, or evidence of the harm you experienced.
To stay current on case developments, claim deadlines, and settlement news, bookmark this page and subscribe to LawsuitWatch alerts. Coverage is updated as new court filings, settlement announcements, and eligibility changes are made public.
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Who Is a Party in a Lawsuit? Plaintiffs, Defendants & Other Participants: Frequently Asked Questions
Answers to the most common questions about this case and your legal options.
What is the difference between a plaintiff and a defendant?
The plaintiff files the lawsuit and seeks a remedy; the defendant is the party being sued and must respond to the claims.
Can I be a party in a lawsuit even if I didn't file it?
Yes -- as a defendant (if sued), a third-party defendant (if brought in by a defendant), or as an intervenor (if you have a legal interest in the outcome).
What is a class action party?
In a class action, named plaintiffs represent the class. All class members -- whether named or not -- are parties whose rights are affected by the outcome.
Do I have to do anything to participate in a class action?
For most class action settlements, you simply submit a claim form when notified. You can also opt out if you want to pursue your own individual claim.
What is legal standing?
Legal standing is the requirement that a party has suffered an actual injury traceable to the defendant's conduct that the court can remedy. Without standing, a court will dismiss the case.