In the plaintiff vs defendant question, the answer is simple: the plaintiff is the person or organisation that starts a lawsuit, and the defendant is the person or organisation being sued or accused. The plaintiff says they were harmed and asks the court for a remedy, such as money or an order. The defendant responds and tries to show they aren’t responsible, or that the plaintiff deserves less than they’re asking for. In criminal cases, the side bringing the case is usually the government, represented by a prosecutor, rather than a private plaintiff.
If you’ve ever looked at a case name like *Smith v. Jones* and wondered who’s who, you’re not alone. The terms show up in news stories, TV dramas and court papers, and they’re easy to mix up. This guide explains the plaintiff vs defendant roles in plain English, with examples, tables and the other legal labels you’ll see along the way.
*This article is general information, not legal advice. For help with a real case, talk to a licensed attorney in your state.*
Key takeaways
- Plaintiff vs defendant: the plaintiff sues, the defendant is sued.
- In criminal cases, the government (the prosecution) brings the case against the defendant.
- In a case name like “Smith v. Jones,” the plaintiff is usually listed first.
- On appeal, the parties may be called appellant and appellee, or petitioner and respondent.
- A defendant can file a counterclaim, which makes them a plaintiff on that claim too.
- The plaintiff usually carries the burden of proof.
Plaintiff vs defendant: the quick comparison
| Plaintiff | Defendant | |
|---|---|---|
| Role | Starts the lawsuit | Responds to the lawsuit |
| Main document | Files a complaint (or petition) | Files an answer or a motion |
| What they want | A remedy: money, an order, or a declaration | To avoid liability or reduce what they owe |
| Burden of proof | Usually carries it | Usually doesn’t, except for certain defences |
| In criminal cases | Replaced by the government (prosecution) | The person accused of a crime |
| Position in case name | Usually first | Usually second |
What is a plaintiff?
A plaintiff is the party who brings a civil lawsuit. They claim that someone else’s actions, or failure to act, caused them harm, and they ask the court to fix it. The harm could be financial, physical, emotional or related to property or rights.
A plaintiff can be:
- An individual, such as a tenant suing a landlord over a withheld deposit.
- A business, such as a supplier suing a customer for an unpaid invoice.
- A government agency, in some civil cases, such as an agency enforcing a regulation.
- A group of people, in a class action, represented by one or more lead plaintiffs.
The plaintiff starts the case by filing a document usually called a complaint. It sets out who the parties are, what happened, which laws were broken and what the plaintiff wants. The plaintiff then has to “serve” the defendant, meaning formally deliver the papers so the defendant knows about the case.
What is a defendant?
A defendant is the party being sued in a civil case, or the person accused in a criminal case. Defendants can also be individuals, businesses or government bodies.
After being served, a civil defendant usually has a deadline to respond, often by filing an answer (admitting or denying the allegations and raising defences) or a motion, such as a motion to dismiss. If the defendant ignores the lawsuit completely, the court may enter a default judgment in the plaintiff’s favour.
In a criminal case, the defendant is the person charged with a crime. They have important constitutional protections in the US, including the right to a lawyer, the right to remain silent and the presumption of innocence.
How to tell who is the plaintiff and who is the defendant
The easiest clue is the case name. In most civil cases in US trial courts, the plaintiff’s name comes first and the defendant’s name comes second, separated by “v.” (short for versus).
| Case name | Plaintiff | Defendant |
|---|---|---|
| Garcia v. Acme Rentals LLC | Garcia (the tenant suing) | Acme Rentals (the landlord being sued) |
| Northside Supply Inc. v. Lee | Northside Supply (owed money) | Lee (accused of not paying) |
| United States v. Johnson | The United States (prosecution) | Johnson (the accused) |
| State v. Miller | The state (prosecution) | Miller (the accused) |
There are exceptions. On appeal, the order of names can change, because the party who lost and appeals is sometimes listed first. So it’s worth checking the documents, not just the title.
Plaintiff vs defendant in civil cases
Most plaintiff vs defendant disputes happen in civil court. Civil cases are disagreements between private parties (or between a private party and the government) about rights and duties, such as contracts, property, injuries or family matters.
Common examples:
| Type of civil case | Typical plaintiff | Typical defendant |
|---|---|---|
| Breach of contract | A business or person who wasn’t paid or didn’t receive what was promised | The party accused of breaking the contract |
| Personal injury | Someone hurt in an accident | The driver, property owner or company blamed |
| Landlord-tenant | A tenant seeking a deposit, or a landlord seeking unpaid rent | The landlord or tenant on the other side |
| Employment | An employee alleging discrimination or wrongful termination | The employer |
| Debt collection | A creditor or collection agency | The person who allegedly owes the debt |
In civil cases, the plaintiff usually has to prove their claim by a preponderance of the evidence, which means it’s more likely than not that their version is true. If the plaintiff wins, the remedy is usually money (damages) or a court order, not jail.
Plaintiff vs defendant in criminal cases
Criminal cases work differently. A crime is treated as an offence against society, so the government brings the case, not the victim. In the US, that’s done by a prosecutor, such as a district attorney or a U.S. attorney.
So in criminal court, you’ll usually hear “prosecution vs defendant” rather than plaintiff vs defendant. The victim is often a witness, not a party to the case.
The prosecution must prove the defendant’s guilt beyond a reasonable doubt, a much higher standard than in civil cases. If the defendant is found guilty, the court can impose penalties such as fines, probation or prison.
| Civil case | Criminal case | |
|---|---|---|
| Who brings the case | The plaintiff | The government (prosecution) |
| Person on the other side | Defendant | Defendant |
| Standard of proof | Preponderance of the evidence | Beyond a reasonable doubt |
| Possible outcome | Damages, orders | Fines, probation, prison |
| Right to a free lawyer | Generally no | Yes, if the defendant can’t afford one and faces possible jail |
Sometimes the same events lead to both. For example, a person accused of assault might face a criminal case brought by the state and a separate civil lawsuit brought by the victim for damages.
Other names for plaintiff and defendant
Courts use different labels depending on the type of case and the stage it’s at. Here are the ones you’re most likely to see.
| Term | What it means |
|---|---|
| Petitioner and respondent | Used in some cases started by a petition, such as divorce, or in appeals to the U.S. Supreme Court |
| Complainant | A person who files a complaint, sometimes used in criminal or administrative matters |
| Claimant | A person making a claim, used in arbitration, small claims and the UK courts |
| Appellant and appellee | On appeal: the appellant appeals, the appellee responds |
| Counterclaimant | A defendant who files a claim back against the plaintiff |
| Third-party defendant | Someone a defendant brings into the case, claiming they are responsible for some or all of the harm |
| Cross-claim | A claim between parties on the same side, such as two co-defendants |
Counterclaims: when the defendant becomes a plaintiff too
A defendant doesn’t have to just defend. They can file a counterclaim against the plaintiff, arguing that the plaintiff actually owes them something.
Example: a contractor sues a homeowner for an unpaid bill. The homeowner responds with a counterclaim, saying the work was defective and cost money to fix. Now each side is both a plaintiff and a defendant, on different claims. The court usually handles both in the same case.
Plaintiff vs defendant on appeal
When a case is appealed, the labels change. The party who lost and asks a higher court to review the decision is the appellant (or petitioner). The other side is the appellee (or respondent). Either the original plaintiff or the original defendant can be the appellant, depending on who lost.
For example, if a defendant loses at trial and appeals, the defendant becomes the appellant, and the original plaintiff becomes the appellee.
Who has the burden of proof?
In most cases, the burden of proof falls on the party making the claim. In civil cases, that’s the plaintiff. They must present enough evidence to convince the judge or jury that their version is more likely true than not. In criminal cases, the prosecution carries the burden.
There are exceptions. A defendant who raises an affirmative defence, such as claiming a contract was signed under duress, may have to prove that defence.
A simple example from start to finish
Here’s how the plaintiff vs defendant roles play out in a typical civil case:
- The dispute. Maria rents an apartment. When she moves out, the landlord keeps her whole security deposit, claiming damage she says she didn’t cause.
- The complaint. Maria files a small claims case. She is the plaintiff; the landlord is the defendant.
- Service. The landlord is formally served with the papers.
- The response. The landlord responds and files a counterclaim for unpaid cleaning costs.
- The hearing. Both sides present evidence: photos, the lease, receipts.
- The decision. The judge decides Maria is owed most of her deposit, minus a small cleaning charge.
Small claims courts are designed for disputes like this, and many people handle them without a lawyer. Rules and dollar limits vary by state.
Do you need a lawyer as a plaintiff or defendant?
It depends on the case. Many people represent themselves in small claims court. For larger or more complex cases, such as serious injuries, employment disputes or criminal charges, a lawyer is strongly recommended. If you’re a criminal defendant who can’t afford a lawyer and you could face jail, you have a right to a court-appointed attorney.
If you’re curious about the people who handle these cases, our guides to litigation lawyer careers and paralegal careers explain what the work involves.
Frequently asked questions
Who is the plaintiff and who is the defendant?
The plaintiff is the person or organisation that starts a lawsuit because they believe they were harmed. The defendant is the person or organisation being sued or, in criminal cases, accused of a crime.
Is the plaintiff the one suing?
Yes. The plaintiff is the party suing. The defendant is the party being sued.
Is the victim the plaintiff in a criminal case?
Usually not. In a criminal case, the government brings the case through a prosecutor. The victim is often a witness. The victim can, however, file a separate civil lawsuit as a plaintiff.
Can the defendant sue the plaintiff back?
Yes. A defendant can file a counterclaim against the plaintiff, which the court usually hears as part of the same case.
What is a third-party defendant?
A third-party defendant is someone the original defendant brings into the lawsuit, claiming that person is responsible for some or all of the plaintiff’s harm.
What does “v.” mean in a case name?
“v.” is short for “versus.” In most trial-court case names, the plaintiff is listed before the “v.” and the defendant after it.
The bottom line on plaintiff vs defendant
The plaintiff vs defendant distinction is simple once you remember it: the plaintiff brings the case, and the defendant answers it. In criminal cases, the government takes the plaintiff’s role through the prosecution. Labels can shift on appeal or when counterclaims are filed, but the basic idea stays the same. Knowing who’s who makes legal news, court documents and your own legal questions much easier to follow.
*Sources: United States Courts, civil cases; United States Courts, criminal cases; Cornell Law School Legal Information Institute, plaintiff and defendant.*
