The same courtroom, the same gavel, sometimes even the same facts — but civil and criminal cases run on completely different rules. Knowing which system a case lives in tells you who can sue, what they can win, and how hard the case is to prove.
Two Different Jobs for the Courts
American courts do two very different jobs, and the split runs through everything else in this article. Criminal law is society's rulebook: it defines conduct so harmful — theft, assault, fraud, murder — that the government itself punishes it. Civil law is the system for settling disputes between private parties: contracts broken, injuries caused, money owed, privacy violated.A useful shorthand: criminal cases are about punishing wrongs against the public, even when one person was the immediate victim. Civil cases are about making an injured party whole, usually with money. That's why a criminal case is captioned something like United States v. Smith or State v. Smith — the government is always the one prosecuting — while a civil case is captioned Smith v. Jones or Smith v. MegaCorp, Inc.
Who Brings the Case
In a criminal case, only the government can prosecute. A prosecutor — a district attorney, a state attorney general, or a U.S. Attorney in federal court — decides whether to bring charges. The victim of a crime is a witness, not a party: they can report the crime and testify, but they cannot force charges to be filed or drop them once filed.In a civil case, the injured person (the plaintiff) is in the driver's seat. Anyone who believes they've been legally wronged can file a complaint, with a lawyer or pro se (representing themselves). Plaintiffs decide whether to sue, whom to sue, and whether to accept a settlement. Government agencies can also bring civil cases — the FTC and state attorneys general sue companies civilly all the time — but the defining feature of civil litigation is that private parties can start it themselves.
What's at Stake: Money vs. Liberty
The remedies are the sharpest dividing line. A criminal conviction can take away liberty — jail or prison time, probation, criminal fines paid to the government, and a criminal record. A civil judgment takes money or compels behavior: compensatory damages, statutory damages, punitive damages in egregious cases, or an injunction ordering a party to do (or stop doing) something. Nobody goes to prison for losing a civil lawsuit.The stakes explain the procedural differences, too. Because a criminal defendant's liberty is on the line, the Constitution gives them protections civil defendants don't get: the right to remain silent, the right to a jury trial for serious offenses, and — under Gideon v. Wainwright — the right to a court-appointed lawyer if they can't afford one. A civil litigant generally has no right to a free lawyer, which is why so many civil parties either hire counsel on contingency or represent themselves.
The Burden of Proof: The Biggest Practical Difference
To convict someone of a crime, the prosecution must prove guilt beyond a reasonable doubt — the law's highest standard, designed to make wrongful convictions rare even at the cost of letting some guilty defendants go free.A civil plaintiff has a much lower bar: preponderance of the evidence, which simply means "more likely than not." If the jury thinks there's a 51% chance the plaintiff's version is true, the plaintiff wins. (Some civil claims, like fraud in certain states, use a middle standard called "clear and convincing evidence.")
This gap is why the same facts can produce opposite results in the two systems. The most famous example is O.J. Simpson: a criminal jury acquitted him of murder in 1995, and two years later a civil jury — hearing a wrongful-death case brought by the victims' families under the lower burden of proof — found him liable and awarded $33.5 million in damages. Neither verdict contradicts the other legally; the two cases simply asked different questions under different standards.
Same Conduct, Both Courts
Because the systems are separate, one act can travel through both. A driver who kills someone while drunk can be prosecuted for manslaughter and sued for wrongful death. A company that lies to investors can face criminal securities-fraud charges from the Department of Justice, a civil enforcement action from the SEC, and private shareholder lawsuits — all over the same conduct.Double jeopardy doesn't prevent this. The Fifth Amendment bars trying someone twice criminally for the same offense; it says nothing about a civil suit following a criminal case. That's also why a criminal conviction often helps the civil plaintiffs who sue afterward — the conviction was proven under a higher standard than the civil case requires.
Where Class Actions Fit
Everything we cover at OpenClassActions.com lives on the civil side. A class action is a civil lawsuit in which one or a few plaintiffs sue on behalf of everyone harmed the same way — and it can only end in civil remedies: a settlement fund, refunds, credit monitoring, or changes in a company's practices. Our guide on what has to be proven in a class action walks through how the preponderance standard plays out in practice.The two systems still meet regularly. Data breaches, price-fixing, and consumer fraud often draw a criminal investigation and a civil class action in parallel, and settlements sometimes follow government enforcement. One hybrid worth knowing: qui tam whistleblower cases under the False Claims Act, where a private person files a civil case on the government's behalf. Where these cases get filed — federal or state court — is its own question, covered in our federal vs. state court explainer.
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Frequently Asked Questions
Can someone be sued and prosecuted for the same conduct?
Yes. A criminal prosecution and a civil lawsuit are separate cases with separate purposes, so the same act can produce both. Double jeopardy only bars a second criminal prosecution for the same offense — it does not stop a private civil suit over the same conduct.
Why can a civil case succeed after a criminal acquittal?
Because the burden of proof is different. A criminal conviction requires proof beyond a reasonable doubt, while a civil plaintiff only has to prove their case by a preponderance of the evidence — more likely than not. The O.J. Simpson cases are the classic example: a criminal jury acquitted him of murder in 1995, and a civil jury found him liable for wrongful death in 1997 and awarded $33.5 million in damages.
Are class actions civil or criminal?
Class actions are always civil. They are brought by private plaintiffs seeking money or changes in conduct, not by prosecutors seeking punishment. A company can face a criminal investigation and a civil class action over the same conduct at the same time, but the class action itself can only end in civil remedies like a settlement fund — never jail time.
Do I get a free lawyer in a civil case?
Generally no. The right to appointed counsel applies to criminal defendants who face jail time and cannot afford a lawyer. Civil litigants normally hire their own attorney, represent themselves pro se, or find contingency-fee or legal-aid representation. Class members in a class action are the exception — class counsel already represents them at no upfront cost.
Sources
• U.S. Courts — Civil Cases (About Federal Courts)• U.S. Courts — Criminal Cases (About Federal Courts)
• Cornell Law School LII — Burden of Proof
