A witness list for court is a formal filing that names every person you plan to have testify, gives their contact information, marks whether you will call them or only might, and briefly describes what each one will say. In federal civil cases you file it at least 30 days before trial, and anyone you leave off can be barred from testifying.1Legal Information Institute. Federal Rules of Civil Procedure Rule 37 – Failure to Make Disclosures or to Cooperate in Discovery; Sanctions State court deadlines vary; some require the list as few as 10 days before trial, and your court’s scheduling order or local rules will give you the exact date.
Note that this covers civil cases. Criminal cases work differently, and that boundary is addressed at the end.
Who Belongs on the List
Before drafting, think broadly about everyone who could help your case. Most people jump straight to eyewitnesses, but a strong list usually draws from three categories.
Fact witnesses testify about events they personally saw, heard, or experienced. In a car accident case, that might be a bystander who watched the collision. In a contract dispute, it could be someone who was in the room during a negotiation. Character witnesses speak to a person’s reputation rather than the specific events of the case. A longtime employer, a member of the clergy, or a community leader might fill that role, and their testimony carries more weight when they have no personal stake in the outcome. Expert witnesses offer opinions based on specialized training, such as a physician in a medical malpractice case or a forensic accountant in a business dispute. Experts come with extra disclosure rules covered below.
One category you do not list: witnesses whose sole purpose is impeaching someone the other side calls.2Legal Information Institute. href=”https://www.law.cornell.edu/rules/frcp/rule_26″ target=”_blank” rel=”noopener”>Federal Rules of Civil Procedure Rule 26 – Duty to Disclose; General Provisions Governing Discovery You cannot predict what opposing witnesses will say, so you are not expected to name your rebuttal witnesses in advance. This exception is narrow. If someone will testify about the core facts of your case and also happens to contradict the other side, that person still belongs on the list.
Competency is rarely a barrier. Under Federal Rule of Evidence 601, every person is presumed competent to testify unless a specific rule says otherwise.3Legal Information Institute. Federal Rules of Evidence Rule 601 – Competency to Testify in General Questions about mental capacity or reliability go to the jury as credibility issues; they do not keep the person off the stand.
What Each Entry Must Include
For every witness on the pretrial list, provide:
- Full legal name as it appears on official identification, not a nickname.
- Current address and phone number. The initial disclosure rules require these only “if known,” but by the pretrial stage you should have them for anyone you actually intend to call.4Legal Information Institute. Federal Rules of Civil Procedure Rule 26 – Duty to Disclose; General Provisions Governing Discovery
- A category designation showing whether you expect to call the witness or may call them if the need arises. The federal rule requires these to be listed separately.
- A brief summary of what the witness will testify about, specific enough to be meaningful.
The testimony summary is where most self-represented litigants slip. A description like “will testify about the accident” tells the court and the other side nothing and invites objections. A workable version reads more like: “Will testify to witnessing the defendant’s vehicle enter the intersection against a red light on May 1, 2025, at the corner of Main Street and Oak Avenue.” Specific enough that the other side can prepare, but not a full script of the testimony.
Extra Requirements for Expert Witnesses
Experts are not just listed. They are disclosed, and the disclosure has to be substantive.
If you hired an expert specifically to testify, or the witness is your employee who regularly serves as an expert, you must produce a written report signed by the expert containing:
- A complete statement of every opinion the expert will offer, with the reasoning behind each one.
- The facts or data the expert considered.
- Any charts, diagrams, or summary exhibits the expert will use.
- The expert’s qualifications, including publications from the last 10 years.
- A list of every case in which the expert testified at trial or by deposition during the previous 4 years.
- The compensation the expert is being paid for the work and testimony.4Legal Information Institute. Federal Rules of Civil Procedure Rule 26 – Duty to Disclose; General Provisions Governing Discovery
Some witnesses were not hired as experts but hold specialized knowledge relevant to the case, such as a treating physician offering opinions about a patient’s injuries. They do not need a full report, but you must still disclose the subject matter they will address and a summary of the facts and opinions they are expected to give.4Legal Information Institute. Federal Rules of Civil Procedure Rule 26 – Duty to Disclose; General Provisions Governing Discovery Skipping this step is common, especially when litigants assume medical records speak for themselves. The disclosure is still required.
Formatting the Document
A witness list is a court filing and needs to look like one. Every filing starts with a caption at the top of the page: the block of text identifying the court, the parties, and the case number.5Legal Information Institute. Federal Rules of Civil Procedure Rule 10 – Form of Pleadings Below the caption, title the document plainly, for example “Plaintiff’s Witness List” or “Defendant’s Pretrial Witness Disclosure.”
Number each witness entry and keep the format consistent: name, contact details, category (will call or may call), and testimony summary. Federal courts have a standard template, Form AO 187, published by the Administrative Office of the U.S. Courts.6United States Courts. Exhibit and Witness List Many state courts have their own mandatory forms. Check your court’s website or call the clerk before formatting from scratch. Using the wrong format is an avoidable delay.
Filing and Serving the List
Two separate steps have to happen before the deadline: filing with the court and serving on the opposing party.
Filing means submitting the original document to the clerk. Most federal courts require electronic filing through CM/ECF, and most state courts now have an equivalent system. If e-filing is not available or you are exempt, you can file by mail or in person. Keep a time-stamped copy showing the filing date.
Serving means delivering a copy to the other party or their attorney. Acceptable methods usually include first-class mail, hand delivery, or electronic service if the other side has consented. After serving, file a proof of service (sometimes called a certificate of service) with the court, stating when, how, and on whom you served the list. This is your evidence that you met the deadline. Without it, the court may treat the list as if it was never served.
Making Sure a Witness Actually Shows Up
Listing someone does not guarantee attendance. Cooperative witnesses come voluntarily. For anyone reluctant or unreliable, you need a subpoena.
In federal court, a subpoena must issue from the court where the case is pending, and either the clerk or an attorney authorized to practice in that court can issue one.7Legal Information Institute. Federal Rules of Civil Procedure Rule 45 – Subpoena The subpoena identifies the court, the case title and number, and states where and when the witness must appear. Anyone at least 18 years old who is not a party to the case can serve it.
There is a geographic limit. A trial subpoena can compel attendance only within 100 miles of where the witness lives, works, or regularly does business in person.7Legal Information Institute. Federal Rules of Civil Procedure Rule 45 – Subpoena If the witness lives farther away, you can still compel attendance within the same state if it would not cause them substantial expense. Otherwise, deposition testimony may be the only option.
When you serve the subpoena, you must tender the witness’s attendance fee. In federal court that fee is $40 per day, plus travel and, if an overnight stay is required, a subsistence allowance.8Office of the Law Revision Counsel. 28 USC 1821 – Per Diem and Mileage Generally State fees are often lower, sometimes only a few dollars per day. A witness who ignores a validly served subpoena can be held in contempt of court, which carries the possibility of fines and imprisonment.9Office of the Law Revision Counsel. 18 USC 401 – Power of Court
Updating the List After You File
Cases change. A witness may become unavailable, or you may learn about someone important you did not know before. You have a standing duty to supplement your disclosures whenever you learn your earlier filing was incomplete or incorrect in a material way.4Legal Information Institute. Federal Rules of Civil Procedure Rule 26 – Duty to Disclose; General Provisions Governing Discovery For expert witnesses, any changes to the report or deposition testimony must be disclosed by the time your pretrial disclosures are due. The longer you wait, the harder it becomes to justify.
If the pretrial deadline has already passed, adding a witness typically requires filing a motion asking the court for permission. Explain why the witness was not listed originally and why adding them is necessary now. The court will weigh whether the addition would unfairly prejudice the other side’s preparation. A witness you knew about for months and simply forgot is a much harder sell than one who became relevant because of a recent development. If the court denies the addition, you cannot call that witness at trial, and the exclusion can be case-ending if the person held critical testimony.1Legal Information Institute. Federal Rules of Civil Procedure Rule 37 – Failure to Make Disclosures or to Cooperate in Discovery; Sanctions
Criminal Cases Work Differently
If your case is criminal rather than civil, the rules are not the same. Federal criminal procedure does not require either the prosecution or the defense to exchange general witness lists before trial.10Justia Law. Fed. R. Crim. P. 16 – Discovery and Inspection The prosecution has to disclose certain witness statements under the Jencks Act, and both sides must provide summaries of any expert testimony they intend to offer, but there is no blanket obligation to hand over a full witness list the way civil litigation requires.
Many federal and state criminal courts still impose witness list requirements through local rules or an individual judge’s pretrial order. If you are a criminal defendant, especially one representing yourself, read the pretrial order in your case carefully. The judge may have set a witness disclosure deadline even though the national rules do not require one, and missing it creates the same exclusion risk as in a civil case.