Vexatious litigant
Vexatious litigant: A person who repeatedly files lawsuits or motions without a good basis, often to harass. Courts may require such a person to get permission before filing new cases. California defines and regulates vexatious litigants in Code of Civil Procedure § 391 and following.

What vexatious litigant means
In practice, you will see vexatious litigant in pleadings, motions, orders and court rules. The definition above explains the general meaning. Even so, the meaning can shift with context. Therefore, always read it alongside the rule or document where it appears.
Where vexatious litigant comes up
The term is used across many kinds of cases. For example, you may see it in pleadings, motions and court orders. To see it in context, browse the motions and procedures library or the Learn the Law topics.
Read the source: Sanctions.
How to research the term
First, read the term where it actually appears. A rule, statute or court decision may define it for its own purposes. Next, check whether your court has a local rule that uses vexatious litigant in a special way. Then look at recent decisions from courts in your jurisdiction. They show how judges apply the term today. Also, remember that state law can differ from federal law. For that reason, use our state procedures guide to find your state’s rules. Finally, confirm every source is current before you rely on it.
You can read the current federal court rules online for free.
Related legal terms
- Venue: the particular court location — district or division — where a case is heard.
- Verdict: the decision of a jury on the questions submitted to it.
- Verification: a sworn statement, usually at the end of a pleading or other filing, confirming that its contents are true.
- Verified complaint: a complaint whose allegations are sworn to or declared true under penalty of perjury.
Why precise terms matter
Legal words often look like everyday words, but they can carry a precise meaning. Because of that, a small misreading can change how you understand a deadline, a duty or a right. Our glossary keeps each definition short and links it to the procedures where it matters.
Sources
Sources last reviewed: 2026-10-24
Lawtopolis provides legal information and education, not legal advice. Using this site does not create an attorney-client relationship. Laws and court rules vary by jurisdiction and change over time; verify every authority against the official source and consult a licensed attorney in your jurisdiction about your situation.
