The plaintiff in a lawsuit is the person, group, or organization that starts a legal case by filing a formal complaint against another party. They are the one saying, “Something wrong was done to me, and I want the court to fix it.”
If you’ve gotten a class action notice in the mail, been injured and wondered about your options, or just tried to follow a major lawsuit in the news, understanding the plaintiff’s role is the first piece of the puzzle.
This guide covers everything: what a plaintiff is, what they do, what rights they have, and what happens when a case goes wrong. We’re also pulling in real examples from active 2024 to 2026 litigation so this isn’t just theory.
One surprising fact: in large mass tort cases like the 3M Combat Arms earplug litigation, there were over 300,000 individual plaintiffs. That’s not a typo.
Who Is the Plaintiff in a Lawsuit?
The plaintiff in a lawsuit is the party who brings the legal action. They are the ones who felt harmed and decided to take that harm to a court of law.
Think of it like being the person who calls a referee when a foul happens in a game. You’re the one saying the rules were broken. You go first. You make the case.
The word “plaintiff” comes from an Old French word meaning “to complain.” That origin still holds up. The plaintiff is literally the complaining party in a civil case.
| Quick Facts | Details |
|---|---|
| Who they are | The party filing the lawsuit |
| What they want | A legal remedy: money, injunction, or judgment |
| Who they sue | The defendant |
| First step | Filing a written complaint with the court |
| Legal burden | Must prove their case to win |
Plaintiffs can be individuals, businesses, nonprofit organizations, or even government agencies. The only requirement is that they have a legitimate legal claim.
The Plaintiff in a Lawsuit Is the Party Who Files the Complaint
The plaintiff in a lawsuit is specifically the party who initiates the case by filing a formal written document called a complaint. That document is the official starting gun of a civil lawsuit.
Without the plaintiff taking that step, there is no lawsuit. The court doesn’t go out looking for wrongdoing on its own in civil cases. Someone has to bring the claim.
The complaint lays out three things:
- The facts of what happened
- The legal theory explaining why the defendant is liable
- The specific remedy the plaintiff is asking for (usually money damages or an order to stop certain behavior)
Once the complaint is filed and the court accepts it, a summons is issued to the defendant. At that point, the lawsuit is officially underway.
Filing fees vary by court. In U.S. federal district courts, the standard civil filing fee as of 2025 is $405. State courts range from $30 to several hundred dollars depending on the state and claim amount.
Key fact: The plaintiff controls whether the case gets filed, and in many cases, whether it settles or goes to trial.
Plaintiff Definition in Law
In legal terms, a plaintiff is defined as the party who initiates a civil lawsuit by filing a complaint and seeking a legal remedy from the court. This definition is consistent across U.S. federal and state civil law.
The term “plaintiff” is used in civil cases. In criminal cases, the government (state or federal) is the party that brings charges, and they are called “the prosecution,” not the plaintiff.
That distinction matters. If someone is arrested for assault, the state brings the criminal case. But the assault victim can separately file a civil lawsuit as a plaintiff seeking money damages for their injuries. Two different legal actions. Two different legal systems.
| Case Type | Suing Party Called | Accused Party Called |
|---|---|---|
| Civil lawsuit | Plaintiff | Defendant |
| Criminal case | The People / The State / The Government | Defendant |
| Family court | Petitioner (often) | Respondent |
| Bankruptcy | Debtor / Creditor (depending on motion) | Varies |
Knowing this distinction helps you make sense of news coverage. When a company settles a lawsuit, a plaintiff agreed to that settlement. When a prosecutor drops charges, no plaintiff is involved.
Plaintiff vs. Defendant in a Lawsuit
The plaintiff and defendant are the two main opposing parties in a civil lawsuit, and their roles are fundamentally different from the start. The plaintiff attacks; the defendant responds.
The plaintiff chose to be there. The defendant usually didn’t. That asymmetry shapes the entire dynamic of civil litigation.
Here’s a clear side-by-side comparison:
| Factor | Plaintiff | Defendant |
|---|---|---|
| Who are they? | Party filing the lawsuit | Party being sued |
| Their goal | Win damages or injunctive relief | Defeat the claim or minimize liability |
| Who moves first? | Yes, files the complaint | Responds with an answer |
| Burden of proof | Carries the burden | Must rebut plaintiff’s case |
| Can they countersue? | Can become a defendant if countersued | Can file a counterclaim against plaintiff |
| Risk if they lose | Loses the case; may owe court costs | May owe plaintiff damages |
One important nuance: defendants can file what’s called a counterclaim. If they do, the original plaintiff suddenly has to defend against that claim too. Cases can get layered quickly.
Key Takeaway: The plaintiff starts the lawsuit, carries the burden of proof, and sets the agenda for the entire case.
What Does the Plaintiff Do in a Lawsuit?
The plaintiff’s job throughout a lawsuit is to build and present a case strong enough to convince a judge or jury that the defendant caused them harm and owes them a remedy.
That sounds simple. In practice, it involves a long list of responsibilities from the first day of filing to the final verdict or settlement.
Here’s what the plaintiff’s role looks like across a typical civil case timeline:
| Phase | What the Plaintiff Does |
|---|---|
| Pre-filing | Gathers evidence, hires attorney, evaluates claim |
| Filing | Submits complaint and pays filing fees |
| Discovery | Produces documents, answers interrogatories, sits for depositions |
| Motions | Responds to defense motions to dismiss or for summary judgment |
| Trial | Presents opening statement, calls witnesses, introduces evidence |
| Post-trial | Can appeal if they lose; collects judgment if they win |
Most plaintiffs work with an attorney on a contingency fee basis. That means the attorney gets paid only if the plaintiff wins, typically 25% to 40% of the recovery.
The plaintiff doesn’t just file and wait. They are active participants. They respond to discovery requests, give depositions, and sometimes testify in open court. It’s demanding work.
Plaintiff Rights in a Civil Lawsuit
Plaintiffs have specific legal rights that protect them throughout the civil litigation process. These rights exist under federal and state procedural rules.
The most fundamental right is the right to have a dispute heard by a court. You can’t be denied access to the courts simply because a defendant has more money or more lawyers.
Key plaintiff rights in a civil case include:
- The right to file a lawsuit if you have legal standing and a valid cause of action
- The right to an impartial judge and, in most civil cases over a certain dollar threshold, the right to a jury trial
- The right to conduct discovery and obtain evidence from the defendant
- The right to present witnesses and introduce exhibits at trial
- The right to appeal an unfavorable verdict to a higher court
- The right to collect a court-ordered judgment if you win
- The right to negotiate and accept or reject a settlement on your own terms
That last point is worth emphasizing. No attorney can force a plaintiff to accept a settlement. The final decision belongs to the client, meaning the plaintiff.
Bold fact: Under Rule 26 of the Federal Rules of Civil Procedure, plaintiffs have the right to demand documents, electronic records, and witness testimony from defendants during the discovery process.
Burden of Proof for the Plaintiff
The burden of proof in a civil lawsuit rests almost entirely on the plaintiff. They must prove their case; the defendant doesn’t have to prove innocence.
This is one of the biggest misconceptions people have when they first learn about lawsuits. In civil court, defendants don’t have to prove they did nothing wrong. The plaintiff must prove they did something wrong.
The standard in civil cases is called “preponderance of the evidence.” That means the plaintiff must show their version of events is more likely true than not, which courts often describe as just over 50% likely.
| Standard | Where It Applies | What It Means |
|---|---|---|
| Preponderance of the evidence | Most civil cases | More likely true than not (51%+) |
| Clear and convincing evidence | Some civil cases (fraud, custody) | Substantially more likely to be true |
| Beyond a reasonable doubt | Criminal cases only | Near certainty of guilt |
This lower standard is why many people who are acquitted in criminal court can still lose civil lawsuits. O.J. Simpson is the most famous example. Criminal acquittal. Civil liability found.
The plaintiff doesn’t need a perfect case. They need a more convincing one.
Key Takeaway: The plaintiff carries the burden of proof in civil court, but the standard is much lower than in criminal cases. More likely true than not is enough to win.
How Does a Plaintiff File a Lawsuit?
A plaintiff files a lawsuit by drafting a formal complaint and submitting it to the appropriate court along with the required filing fee. That is the official start of civil litigation.
The process has more steps than people expect. Here’s the full sequence:
Step 1: Identify the right court.
Federal courts handle cases involving federal law or disputes between parties from different states worth more than $75,000. State courts handle most personal injury, contract, and family law claims.
Step 2: Draft the complaint.
The complaint names the defendant, states the facts, identifies the legal claims (called “causes of action”), and asks for specific relief.
Step 3: File the complaint and pay the fee.
Once filed, the court clerk stamps the complaint with a case number. In federal court, the fee is currently $405.
Step 4: Serve the defendant.
The plaintiff must formally deliver the complaint and summons to the defendant. This is called “service of process.” The defendant then has a set time (usually 21 days in federal court) to respond.
Step 5: Wait for the answer.
The defendant files a response. The litigation timeline begins.
Most plaintiffs don’t do this alone. Attorneys handle the drafting and filing. For people who can’t afford an attorney, legal aid organizations and pro se clinics provide assistance.
Who Can Be a Plaintiff in a Lawsuit?
Any person, business, organization, or government entity that has suffered a legally recognized harm and has “standing” to sue can be a plaintiff in a lawsuit. Standing is the key requirement.
Legal standing means three things in federal court, based on the standard from Lujan v. Defenders of Wildlife (1992):
- The plaintiff suffered an actual injury
- That injury was caused by the defendant’s actions
- A court ruling can redress (fix) the injury
Without all three, a federal court can throw the case out before it even starts.
Beyond standing, the plaintiff must be a legal person. Real people obviously qualify. But so do corporations, partnerships, nonprofits, trusts, and government agencies. Even a deceased person’s estate can be a plaintiff in wrongful death cases.
| Who Can Be a Plaintiff | Example |
|---|---|
| Individual person | Car accident victim suing a driver |
| Corporation | Company suing a competitor for patent infringement |
| Government agency | FTC suing a company for consumer fraud |
| Nonprofit organization | Environmental group suing a polluter |
| Estate of a deceased person | Family suing on behalf of someone who died |
| Group of people (class) | Consumers in a class action lawsuit |
Age is one limitation. Minors can be plaintiffs, but they need a parent or guardian to file on their behalf. Courts call this filing “through a next friend.”
Types of Plaintiffs in Civil Cases
There are several distinct types of plaintiffs in civil litigation, and the type matters because it affects how the case is structured, who controls decisions, and how any recovery is distributed.
Here are the main categories:
Individual Plaintiff
One person suing one or more defendants. Most personal injury cases work this way.
Named Plaintiff (Lead Plaintiff)
In a class action, one person (or a small group) officially represents all class members. They’re called the named or lead plaintiff.
Class of Plaintiffs
Thousands or millions of people who are represented collectively without having to each file separately. Think of the Equifax data breach settlement in 2019, which covered 147 million Americans.
Nominal Plaintiff
A party listed in a lawsuit to satisfy procedural rules, but who has no actual stake in the outcome. This comes up in shareholder derivative suits.
Third-Party Plaintiff
A defendant who files a claim against another party, bringing that new party into the lawsuit. They become a third-party plaintiff.
| Plaintiff Type | Description | Common Case Type |
|---|---|---|
| Individual plaintiff | Single person with a personal claim | Personal injury, discrimination |
| Named plaintiff | Class representative in a group lawsuit | Class action |
| Class members | All affected people represented as a group | Consumer fraud, data breach |
| Nominal plaintiff | Listed for procedural reasons only | Shareholder derivative suits |
| Third-party plaintiff | Defendant who sues another party | Multi-party commercial disputes |
Understanding which type you are in a case changes what you can expect and what you can control.
Key Takeaway: Not all plaintiffs have the same level of control over a case. Named plaintiffs in class actions have real decision-making power; class members generally do not.
Can a Company Be a Plaintiff in a Lawsuit?
Yes, a company can absolutely be a plaintiff in a lawsuit. Businesses sue other businesses, governments, and individuals all the time. Corporate litigation makes up a massive share of U.S. civil court dockets.
Some of the most significant recent plaintiff-side corporate actions include:
- Technology companies suing each other over patent rights
- Pharmaceutical companies suing competitors over generic drug market entry (ANDA litigation)
- Retailers suing suppliers for breach of contract after supply chain failures during 2020 to 2023
- Insurers suing third parties to recover money paid out on claims (subrogation lawsuits)
A company suing as a plaintiff follows the same basic rules as an individual plaintiff. It needs legal standing. It files a complaint. It carries the burden of proof.
One difference: companies almost always have legal counsel. They rarely proceed without attorneys. Courts in some jurisdictions actually require corporations to be represented by licensed attorneys in all filings.
Example from 2024: Several major U.S. news publishers, including The New York Times, filed suit against OpenAI and Microsoft in late 2023, seeking damages for alleged copyright infringement. The publishers are the plaintiffs in that ongoing litigation.
Companies can also be both plaintiff and defendant in the same lawsuit if counterclaims are filed. In complex commercial disputes, that happens constantly.
Named Plaintiff in a Class Action Lawsuit
The named plaintiff in a class action lawsuit is the individual (or small group) who officially represents all other class members in the litigation. They stand in for potentially thousands or millions of people with similar claims.
Being the named plaintiff is a completely different experience than being an ordinary class member.
Here’s how they differ:
| Factor | Named Plaintiff | Class Member |
|---|---|---|
| Role | Represents the entire class | Benefits from the case |
| Involvement | Active: depositions, court appearances | Passive: files a claim form |
| Decision-making | Approves or rejects settlements | Limited; can object but not veto |
| Compensation | May receive a “class representative payment” | Receives standard settlement share |
| Attorney contact | Direct, ongoing | Little to none |
| Typical extra payment | $2,000 to $25,000 or more | Whatever the standard payout is |
Named plaintiffs take on legal obligations. They answer interrogatories. They sit for depositions. Their personal history can be scrutinized by the defense.
In the Roundup weed killer litigation against Bayer/Monsanto, named plaintiffs who went to trial received individual verdicts sometimes reaching $80 million or more. Class members in settlements received far less.
The named plaintiff in a class action is vetted by the court. The judge must certify that the named plaintiff is adequate to represent the class.
Plaintiff in a Personal Injury Lawsuit
The plaintiff in a personal injury lawsuit is the person who was physically, emotionally, or financially harmed by someone else’s negligence or intentional wrongdoing. They are seeking money to compensate for that harm.
Personal injury is one of the most common lawsuit types in the U.S. Car accidents, slip and falls, dog bites, medical malpractice, and defective products all generate personal injury plaintiffs every single day.
What a personal injury plaintiff typically seeks:
- Medical expenses: Past and future treatment costs
- Lost wages: Income lost during recovery
- Pain and suffering: Compensation for physical and emotional distress
- Loss of enjoyment of life: Reduced quality of life from the injury
- Punitive damages: Available in cases of extreme misconduct (not always)
| Damage Type | What It Covers | Who Gets It |
|---|---|---|
| Compensatory | Actual losses (medical, wage, property) | Plaintiff |
| Non-economic | Pain, suffering, emotional distress | Plaintiff |
| Punitive | Punishment for egregious conduct | Plaintiff (rare) |
| Wrongful death | Losses suffered by family members | Plaintiff’s family |
According to data from court studies, the median jury award in personal injury cases involving serious injuries ranges from $100,000 to $400,000, depending on the jurisdiction and type of case.
Most personal injury plaintiffs never see a courtroom. Roughly 95% of civil cases settle before trial, according to data from the U.S. Department of Justice’s Bureau of Justice Statistics.
Plaintiff in a Class Action Lawsuit
The plaintiff in a class action lawsuit is either the named representative or one of the thousands (sometimes millions) of class members who share a common legal claim against the same defendant. Class actions let people with small individual claims sue together.
Class actions exist because sometimes one person’s individual harm is too small to justify suing on their own. But when a company harms millions of people even slightly, the total harm is massive. Class actions are the mechanism for addressing that.
Recent class action cases with significant plaintiff pools include:
- Facebook/Meta: Over 44 million users were part of a settlement class in the 2022 Illinois Biometric Information Privacy Act case, with a $650 million settlement.
- T-Mobile data breach (2023): Millions of customers affected; class settlement of $350 million approved.
- Southwest Airlines (2023): Passengers affected by the December 2022 meltdown sought class action status.
Being a class action plaintiff (as a class member) means you automatically benefit from the settlement if you meet the class definition. You usually just need to submit a claim form. Sometimes you don’t even need to do that.
Key Takeaway: Class action plaintiffs can range from one named representative to tens of millions of class members. Your role and your payout depend entirely on which category you fall into.
Plaintiff Role in Mass Tort Litigation
The plaintiff in a mass tort case is an individual who files their own separate personal injury lawsuit but whose case is coordinated with thousands of similar claims against the same defendant. Unlike class actions, each mass tort plaintiff has their own case and their own potential payout.
This distinction is huge. In a class action, everyone gets roughly the same settlement. In a mass tort, payouts vary dramatically based on individual injury severity.
The 3M Combat Arms earplug litigation is a defining example. Filed in federal court in the Northern District of Florida (In Re: 3M Combat Arms Earplug Products Liability Litigation, MDL No. 2885), this case involved more than 300,000 individual plaintiffs, all veterans who claimed hearing damage from defective earplugs.
3M agreed to pay $6.01 billion to resolve those claims in 2023. Individual payouts varied based on documented hearing loss severity.
Other major mass tort plaintiff pools in 2024 to 2026:
| Case | Defendant | Approximate Plaintiffs | Settlement Range |
|---|---|---|---|
| Roundup (glyphosate) | Bayer/Monsanto | 100,000+ | Ongoing; $11B+ committed |
| Talc / Ovarian cancer | Johnson & Johnson | 70,000+ | Ongoing; contested |
| Opioid litigation | Purdue Pharma and others | Thousands of governments and individuals | $26B+ across defendants |
| CPAP devices | Philips Respironics | 500,000+ | Settlement ongoing |
As a mass tort plaintiff, you need to actively participate. You work with your own attorney. You provide medical records. Your individual damages are evaluated separately from everyone else’s case.
What Happens to the Plaintiff If They Lose?
If a plaintiff loses a civil lawsuit, they do not receive any money or remedy from the defendant. The case ends, and the defendant is not liable for the claimed harm.
Losing doesn’t automatically mean owing money to the defendant. Under the “American Rule,” each party pays their own attorney’s fees regardless of who wins. This is different from many other countries where the losing party pays the winner’s legal costs.
However, there are exceptions:
- Some contracts include “fee-shifting” clauses requiring the loser to pay attorney’s fees
- Some statutes (like civil rights laws) allow prevailing parties to recover fees from the loser
- Courts can award “costs” (filing fees, deposition costs, etc.) to the winning defendant
What the plaintiff risks by losing:
- Loss of the time and stress invested in litigation
- Their own attorney’s fees if they paid any out of pocket
- Certain court costs awarded to the defendant
- The emotional toll of hearing their claim rejected
- If on contingency: usually no out-of-pocket loss, but the attorney absorbs the cost
If a plaintiff on contingency loses, they typically owe nothing to their attorney. The attorney absorbs the loss of time and expenses. That’s the risk attorneys take.
Plaintiffs who lose can appeal to a higher court if they believe legal errors were made at trial. Appeals are time-consuming and expensive. Most lose. But notable overturns do happen.
Plaintiff vs. Petitioner: What’s the Difference?
A plaintiff and a petitioner are both parties who initiate legal proceedings, but the terms apply to different types of cases. Understanding which term applies tells you a lot about what kind of court you’re in.
“Plaintiff” is used in civil litigation where two parties are suing each other over a legal dispute. “Petitioner” is used in proceedings where someone is asking a court to make a ruling without necessarily having an opposing party to “sue.”
Common uses:
| Term | Where It’s Used | Opposing Party Called |
|---|---|---|
| Plaintiff | Civil lawsuits (personal injury, contracts, etc.) | Defendant |
| Petitioner | Family court (divorce, custody), appeals, immigration | Respondent |
| Complainant | Administrative proceedings, some criminal contexts | Respondent |
| Claimant | Insurance claims, workers’ comp, some civil claims | Insurer or employer |
In divorce cases, the person filing is often called the petitioner. The spouse who receives the divorce papers is the respondent.
In appellate courts, the party appealing a lower court’s decision is called the “petitioner” or “appellant,” not the plaintiff, even if they were the plaintiff in the original trial.
The functional role is the same: the petitioner or plaintiff is the one who set the legal process in motion. The terminology just shifts with the court type.
How Is the Plaintiff Different from the Complainant?
A plaintiff and a complainant are similar but not identical. A complainant is someone who reports a problem or files a complaint with an administrative body. A plaintiff files a lawsuit in a court of law.
Think of the difference this way. If you report a company to the Consumer Financial Protection Bureau for deceptive practices, you are a complainant in an administrative process. If you take that same company to civil court yourself, you are now a plaintiff.
The government agency you complained to might then bring its own legal action. In that case, the agency becomes the plaintiff (or prosecutor in criminal matters), not you personally.
Key differences:
| Factor | Plaintiff | Complainant |
|---|---|---|
| Where they file | Civil court | Administrative agency or regulatory body |
| Legal process | Lawsuit | Administrative complaint or report |
| Direct control | High: controls case decisions | Low: agency decides what to do with it |
| Personal recovery | Yes, if they win | Rarely directly |
| Examples | Suing for personal injury | Reporting to EEOC, CFPB, FDA, FTC |
In employment discrimination cases, you typically must file a complaint with the Equal Employment Opportunity Commission (EEOC) first. Once the EEOC issues a “right to sue” letter, you become a plaintiff by filing suit in federal or state court.
The two roles often work together. The complainant stage often precedes the plaintiff stage in administrative law contexts.
Key Takeaway: The terminology used for the party who brings a legal action (plaintiff, petitioner, complainant, claimant) tells you exactly what type of legal forum you’re dealing with and how much control that party has over the outcome.
Frequently Asked Questions
Who is the plaintiff in a lawsuit and what do they want?
The plaintiff in a lawsuit is the party who filed the case, and what they want is a legal remedy, usually money or a court order.
They believe the defendant harmed them in a legally recognized way.
Their goal from day one is to convince a judge or jury that they deserve what they’re asking for.
What is the difference between a plaintiff and a defendant?
The plaintiff files the lawsuit; the defendant is the party being sued.
The plaintiff carries the burden of proof and moves the case forward.
The defendant responds to the claims and tries to defeat them or minimize liability.
Can a business or organization be a plaintiff in a lawsuit?
Yes, businesses, nonprofits, government agencies, and estates can all be plaintiffs.
Any legal entity with standing to sue and a valid claim can file a lawsuit.
Corporate plaintiffs follow the same procedural rules as individual plaintiffs.
What happens to a plaintiff who loses a civil lawsuit?
A plaintiff who loses receives no damages and the case is dismissed.
Under the American Rule, they typically do not have to pay the defendant’s attorney’s fees, though court costs may be awarded against them.
They have the right to appeal if legal errors occurred during the trial.
What is a named plaintiff in a class action lawsuit?
A named plaintiff is the individual who officially represents all class members in a class action case.
They are more involved than regular class members, attending depositions and participating in settlement decisions.
Named plaintiffs often receive an additional payment of several thousand dollars for their extra role.
Your Next Step Starts With Knowing Where You Stand
Understanding the plaintiff’s role is the foundation of understanding any civil lawsuit. Whether you got a class action notice in the mail, you’re thinking about filing your own case, or you’re just trying to follow a major lawsuit in the news, the plaintiff is always the party that started it all.
If you believe you have a claim, check whether the harm you suffered meets the three requirements for legal standing: an actual injury, caused by someone else, that a court can fix.
Class action and mass tort settlements happen every single month. Knowing whether you qualify as a class member or an individual plaintiff can be the difference between getting nothing and getting compensated.
