Contempt of court, often referred to simply as "contempt", is the crime of being disobedient to or disrespectful toward a court of law and its officers in the form of behavior that opposes or defies the authority, justice, and dignity of the court. A similar attitude toward a legislative body is termed contempt of Parliament or contempt of Congress. The verb for "to commit contempt" is contemn (as in "to contemn a court order") and a person guilty of this is a contemnor or contemner.

There are broadly two categories of contempt: being disrespectful to legal authorities in the courtroom, or willfully failing to obey a court order. Contempt proceedings are especially used to enforce equitable remedies, such as injunctions. In some jurisdictions, the refusal to respond to subpoena, to testify, to fulfill the obligations of a juror, or to provide certain information can constitute contempt of the court.

When a court decides that an action constitutes contempt of court, it can issue an order in the context of a court trial or hearing that declares a person or organization to have disobeyed or been disrespectful of the court's authority, called "found" or "held" in contempt. That is the judge's strongest power to impose sanctions for acts that disrupt the court's normal process.

A finding of being in contempt of court may result from a failure to obey a lawful order of a court, showing disrespect for the judge, disruption of the proceedings through poor behavior, or publication of material or non-disclosure of material, which in doing so is deemed likely to jeopardize a fair trial. A judge may impose sanctions such as a fine, jail or social service for someone found guilty of contempt of court, which makes contempt of court a process crime. Judges in common law systems usually have more extensive power to declare someone in contempt than judges in civil law systems.

Contempt of court is essentially seen as a form of disturbance that may impede the functioning of the court. The judge may impose fines and/or jail time upon any person committing contempt of court. The person is usually let out upon an agreement to fulfill the wishes of the court. Civil contempt can involve acts of omission. The judge will make use of warnings in most situations that may lead to a person being charged with contempt if the warnings are ignored. It is relatively rare that a person is charged for contempt without first receiving at least one warning from the judge. Constructive contempt, also called consequential contempt, is when a person fails to fulfill the will of the court as it applies to outside obligations of the person. In most cases, constructive contempt is considered to be in the realm of civil contempt due to its passive nature.

Indirect contempt is something that is associated with civil and constructive contempt and involves a failure to follow court orders. Criminal contempt includes anything that could be considered a disturbance, such as repeatedly talking out of turn, bringing forth previously banned evidence, or harassment of any other party in the courtroom, including committing an assault against the defendant in a criminal case. There have been instances during murder trials that grieving family members of murder victims have attacked the defendants in courtrooms in plain view of judges, bailiffs, and jurors, leading to said family members to be charged with contempt. Direct contempt is an unacceptable act in the presence of the judge (in facie curiae), and generally begins with a warning; it may be accompanied by the immediate imposition of a punishment.

In Australia, a judge may impose a fine or jail for contempt of court.

A Belgian correctional or civil judge may immediately try the person for insulting the court.