A codefendant is one of two or more defendants in the same criminal prosecution or civil lawsuit. The label identifies a shared position in a case; it does not establish that everyone committed the same acts, faces identical allegations or will receive the same outcome.

Codefendant and co-defendant refer to the same role. “Co defendant” is also a common search spelling; this page uses the closed form consistently. A defendant may be a person or, where the proceeding permits, an organization. Being named alongside someone else does not itself prove guilt or civil liability.

Codefendants in criminal and civil cases

The first distinction is the type of proceeding. A criminal prosecution seeks to establish an offense; civil litigation resolves claims for relief. A private damages dispute does not become a criminal case merely because several people are accused of wrongdoing.

The federal rules below are labeled examples. State procedure, applicable substantive law and the court’s orders may differ. Neither the table nor the word “codefendant” settles the merits of a particular case.

Why criminal codefendants may be charged together

Under Federal Rule of Criminal Procedure 8(b), an indictment or information may charge multiple defendants alleged to have participated in the same act or transaction, or the same series of acts or transactions constituting offenses. They may be charged together or separately in different counts; every defendant need not appear in every count.

That is more precise than saying anyone accused of similar crimes can be grouped together. Rule 8(a)’s rule about joining offenses against one defendant should not be substituted for Rule 8(b)’s test for multiple defendants. The current official criminal rules contain both provisions, along with the plea, severance and representation rules discussed below.

For a reader looking at charging papers, the practical task is to identify the particular Charge and count alleged against each person. A shared case caption does not mean every allegation is made against everyone. It also does not turn an allegation about one defendant into proof against another.

Can codefendants be tried separately?

Yes. Joinder means bringing defendants or charges together under the applicable rules. Severance separates defendants’ trials or charges when the governing standard is met. These are related questions, but permission to charge together and fairness of trying together are not identical inquiries.

In federal criminal cases, Rule 14(a) allows a court to order separate trials of counts, sever defendants’ trials or provide other appropriate relief if joinder appears prejudicial to a defendant or the government. Rule 14(b) also allows the court to inspect a defendant’s proposed statement privately before deciding a severance motion.

A request for separation is not a guarantee of a separate trial. In Zafiro v. United States, 506 U.S. 534 (1993), the Supreme Court recognized the federal preference for joint trials of jointly indicted defendants: they can promote efficiency and avoid inconsistent verdicts. For properly joined defendants, the Court identified a serious risk to a specific trial right, or to the jury’s ability to make a reliable guilt determination, as the central severance concern. Less drastic safeguards may suffice.

Common arguments need concrete support:

• Mutually exclusive defenses: Each defendant may argue that accepting the other’s defense would defeat their own. Zafiro rejected automatic severance merely because defenses conflict; identify the actual effect on a fair determination.
• Uneven evidence or culpability: Strong evidence against one person may risk spilling over onto another, particularly in a complex case. Explain what evidence belongs to whom and why appropriate instructions or other safeguards would be insufficient.
• Unavailable exculpatory evidence: A defendant may argue that important evidence supporting their innocence would be available separately but unavailable jointly. A hope that a codefendant might help is not the same as showing that the evidence would actually be available and material; the applicable court’s requirements matter.
• A statement that compromises confrontation rights: The exact statement and proposed use may require exclusion, a permissible redaction, separate proceedings or another remedy. The confession discussion below explains why not every statement produces the same answer.

These are issues for legal analysis, not a checklist that automatically wins a motion. The evidence, applicable standards and possible remedies must be assessed in the particular case.

Can one codefendant testify or make a deal?

A codefendant can become a witness against another, including in connection with a cooperation arrangement. The Justice Department’s cooperation guidance, a description of federal prosecution policy rather than an entitlement to a deal, discusses plea-based cooperation and immunity as distinct routes. But live testimony, a guilty plea and an out-of-court statement repeated by someone else are different things. Each raises its own questions about rights, admissibility and how the evidence may be used.

Federal Rule 11 addresses the defendant’s trial rights, including protection against compelled self-incrimination, and the requirements for accepting a plea. A defendant is not required to testify merely because another defendant wants that testimony. Whether testimony can be compelled requires analysis of any applicable privilege, immunity and other law.

A deal also does not necessarily promise a particular sentence. Rule 11 distinguishes a sentencing recommendation that does not bind the court from a specified disposition that binds it once the court accepts that type of agreement. Cooperation does not create an automatic discount or establish another defendant’s guilt.

If a codefendant does testify, the testimony may be tested through cross-examination under the applicable rules. A witness’s incentives can matter to credibility. The Federal Rules of Evidence include rules on witness competence, personal knowledge and challenges to credibility; the fact that someone is a codefendant does not by itself decide whether every statement is admissible or believable.

Why one codefendant’s statement can matter

A special concern arises when a prosecutor uses a nontestifying codefendant’s confession that directly implicates another defendant at their joint criminal trial. The other defendant cannot cross-examine the speaker about that confession. The Supreme Court’s Bruton line of cases addresses this Confrontation Clause problem; an instruction to consider the confession only against its maker does not always cure it.

The limits matter too. In Samia v. United States, 599 U.S. 635 (2023), the Court upheld admission of a confession modified so it did not directly inculpate the other defendant, accompanied by a proper limiting instruction. The opinion distinguishes that situation from directly accusatory statements and certain obvious redactions. It does not authorize every edited confession.

The useful question is therefore more specific than “Did a codefendant say something?” Ask whether the speaker testifies, what the statement actually says, whose case it is offered against and what safeguards the court proposes. The exact wording, use and applicable precedent require careful legal review. This short explanation does not determine admissibility in an actual prosecution.

How civil codefendants can differ

Federal Rule of Civil Procedure 20(a)(2) permits joining defendants when the claimed relief arises from the same transaction, occurrence or series and a common question of law or fact will arise. Rule 20(a)(3) expressly allows relief against defendants according to their respective liabilities; each need not defend against every form of relief demanded.

The official civil rules also distinguish severing claims under Rule 21 from ordering separate trials under Rule 42(b). Those procedural tools do not themselves establish who owes Damages, how responsibility is allocated or whether joint-and-several liability applies. Those questions depend on the claims, proof and governing law.

A settlement involving one defendant does not, simply because the defendants share a case, resolve every claim against the others. Its scope and effect need to be checked under the agreement, applicable law and any required court order.

Three codefendant examples

These are fictional illustrations, not predictions of a result.

1. A shared robbery prosecution: Two people are charged over an alleged robbery, but one also faces a separate count. They are codefendants in the prosecution. The count-by-count allegations, available evidence and each person’s plea must still be distinguished; a shared charge is not a shared finding of guilt.
2. A multi-vehicle collision lawsuit: An injured passenger sues two drivers. The drivers may present different accounts and defenses, and the claim against one may resolve before the claim against the other. Naming both does not decide negligence, damages or how any responsibility is divided.
3. A confession at a joint trial: One accused person gives police a confession naming another, then does not testify. Before that statement is used at a joint trial, counsel and the court must address confrontation and evidentiary questions. Neither “the jury will be instructed” nor “the name will be removed” supplies a complete answer on its own.

What to check when there is more than one defendant

Use this short sequence to avoid drawing conclusions from the caption alone:

• Identify the proceeding: Criminal prosecution or civil claim, and which jurisdiction’s rules apply?
• Match allegations to parties: Which counts, acts, claims and requested remedies concern each defendant?
• Check the court’s arrangement: Are the defendants jointly charged, set for a joint trial, severed or subject to separate-trial orders?
• Separate evidence from outcome: Is the issue testimony, a recorded statement, a plea, a verdict or a sentence? Each requires its own analysis.

These checks organize the questions; they do not replace advice about deadlines, motions, representation or defense strategy.

Common questions

Should codefendant be hyphenated?

Both “codefendant” and “co-defendant” identify the same legal role. Use one form consistently in ordinary prose and preserve the wording used in a quotation or court document. A hyphen does not change someone’s rights or the charges against them.

Can codefendants have the same lawyer?

Joint representation can raise serious conflicts. Federal criminal Rule 44(c) requires a prompt judicial inquiry and personal advice about effective assistance of counsel, including separate representation, when its joint-representation conditions apply. It is not a rule that every pair of codefendants must share counsel—or that joint representation is automatically acceptable because both agree.

Do codefendants get the same sentence?

Not necessarily. They may have different convictions, records, conduct and applicable sentencing factors. Federal 18 U.S.C. §3553(a) directs consideration of individual offense and defendant characteristics and the need to avoid unwarranted disparities among similarly situated defendants. That does not promise identical sentences. Sharing a case alone predicts neither the sentence nor whether someone will be convicted.

What if one codefendant pleads guilty?

The plea concerns that defendant’s case and admitted offense. It does not itself establish another defendant’s guilt or require the others to plead guilty. Whether the pleading defendant later testifies, what statements may be admitted and what remains for trial depend on the agreement, rights, evidence and court rulings.

For an actual case, identify the governing court, relevant documents and each defendant’s individual position. Seek case-specific legal advice before assuming that another defendant’s decisions protect your interests or determine your result.