What Is a Case Caption? Required Elements and Format Rules

A case caption is the heading at the top of a court filing that identifies the case. It names the court, the parties, the case number, and the type of document, and it appears on the first page of every pleading, motion, order, and notice in the file.

What a Caption Must Contain

Federal Rule of Civil Procedure 10(a) sets the baseline: every pleading needs a caption with the court’s name, a title, a file number, and a designation of what the document is.¹ In practice, that comes out as four stacked pieces of information:

The full name of the court, such as “United States District Court for the Eastern District of Virginia” or “Superior Court of the State of California, County of Los Angeles.”
The party names, listed on opposite sides of a “v.” In a civil case, the person who filed is the plaintiff and the person being sued is the defendant.
The case number, a unique identifier the court assigns when the case is first filed. You won’t have this number when drafting an initial complaint; leave a blank space and the clerk fills it in.
The document title, a short label such as “Complaint,” “Motion to Dismiss,” or “Answer.”

Many courts also want the filer’s contact block in the caption area. Attorneys list their name, address, and phone number; self-represented litigants put their own information there instead.²

How the Format Changes by Case Type

Civil Cases

The standard format is “Plaintiff v. Defendant.” The initial complaint must name every party in the caption.¹ After that, later filings only need the first party on each side and can refer to the rest generally. In some civil proceedings, particularly family law and immigration matters, the parties are labeled “Petitioner” and “Respondent” instead.

Criminal Cases

In a criminal case, the government is the prosecuting party. A federal criminal caption reads “United States v. [Defendant Name].” State practice varies: some states use “State v.,” others use “People v.” or “Commonwealth v.” The defendant is never called the plaintiff, and the prosecutor’s office, not an individual prosecutor, appears as the opposing party.

Appellate Cases

When a case moves to an appeals court, the labels shift. The party challenging the lower court’s decision is the appellant and the other side is the appellee. Federal appellate rules require the circuit clerk to docket the appeal under the title used in the district court action and identify the appellant by name.³

Multiple Parties and “Et Al.”

Cases with dozens of plaintiffs or defendants create a practical problem: you can’t fit forty names into a readable heading. Rule 10(a) handles this by requiring the complaint to name every party and allowing later filings to abbreviate.¹ After the complaint, list the first plaintiff and first defendant by name and add “et al.” (Latin for “and others”) for the rest. Class actions rely on this heavily. A case brought on behalf of thousands of consumers might appear as “Smith v. Acme Corporation, et al.”

“Et al.” only shortens the caption. The body of the complaint still has to identify every party, usually in numbered paragraphs near the beginning.

When Real Names Aren’t Required

Federal rules generally require every action to be brought in the real party’s name.⁴ Courts do permit pseudonyms like “Jane Doe” or “John Doe” when privacy concerns are serious enough, but only after a motion asking for permission. File that motion with the complaint; waiting can put the whole case at risk of dismissal.

Judges weigh the party’s privacy interests against the public’s right to know who is involved in litigation. Factors that favor a pseudonym include risk of retaliation, involvement of minors, sensitive medical information, and situations where the litigation itself would force disclosure of extremely private details. Sexual assault survivors and whistleblowers are among the most common contexts where courts grant anonymous filing. Wanting to avoid embarrassment or negative publicity, on its own, usually isn’t enough.

Caption Mistakes That Get Filings Rejected

Caption errors sound trivial until your filing bounces. Courts that use electronic filing are especially unforgiving, and some errors trigger an automatic deficiency notice or administrative closure, forcing a fresh case number.⁵ The errors that cause the most trouble:

Wrong case number. Transposed digits or a leftover number from a related proceeding. Check the court’s docket before every filing.
Misspelled party names. Your motion caption should match the complaint caption exactly. If the original complaint misspelled a name, file a motion to amend the caption rather than quietly fixing it on later documents.
Wrong court or division. Listing the wrong judicial district or county happens often, especially when attorneys handle cases across jurisdictions and reuse templates.
Missing parties on a complaint. The initial complaint must name every party in the caption. “Et al.” is not allowed on the first filing.¹
A blank case number on later filings. The blank is only appropriate on the original complaint before the clerk assigns a number. Every document after that needs the assigned number.

If you catch a mistake after filing, act quickly. Some courts let you correct the document through the electronic filing system. If the clerk has already flagged it, you may need to refile as a new submission rather than amend the deficient one.⁵

Why the Caption Carries So Much Weight

Court clerks use the caption to route every filing to the right case folder, and a mismatch between the number on your document and the court’s records can mean the filing never reaches the judge. In busy courts handling thousands of active cases, the caption is the primary sorting mechanism.

The caption also establishes jurisdiction. A filing captioned for the wrong court signals a jurisdictional problem before anyone reads the first paragraph, and opposing counsel will notice. And because most court filings are public, the caption is how journalists, researchers, and anyone else searching the docket find and identify a case.

1
Legal Information Institute. Federal Rules of Civil Procedure Rule 10
2
U.S. District Court for the District of Delaware. Pro Se Handbook
3
United States Courts. Federal Rules of Appellate Procedures
4
Legal Information Institute. Federal Rules of Civil Procedure Rule 17
5
U.S. District Court for the Central District of California. What Should I Do If I Discover Errors in My E-Filed Document