A court is any person or institution, often as a government institution, with the authority to adjudicate legal disputes between parties and carry out the administration of justice in civil, criminal, and administrative matters in accordance with the rule of law. In both common law and civil law legal systems, courts are the central means for dispute resolution, and it is generally understood that all people have an ability to bring their claims before a court. Similarly, the rights of those accused of a crime include the right to present a defense before a court.

The system of courts that interprets and applies the law is collectively known as the judiciary. The place where a court sits is known as a venue. The room where court proceedings occur is known as a courtroom, and the building as a courthouse; court facilities range from simple and very small facilities in rural communities to large complex facilities in urban communities.

The practical authority given to the court is known as its jurisdiction (from Latin iūrisdictiō, from iūris, "of the law," + dīcō, "to declare," + -tiō, noun-forming suffix), the court's power to decide certain kinds of questions or petitions put to it. According to William Blackstone's Commentaries on the Laws of England, a court (for civil wrongs) is constituted by a minimum of three parties: the āctor or plaintiff, who complains of an injury done; the reus or defendant, who is called upon to make satisfaction for it; and the jūdex or judicial power, who is to examine the truth of the fact, determine the law arising upon that fact, and, if any injury appears to have been done, ascertain and by its officers apply a legal remedy. It is also usual in the superior courts to have barristers, and attorneys or counsel, as assistants, though, often, courts consist of additional barristers, bailiffs, reporters, and perhaps a jury.

The term "the court" is also used to refer to the presiding officer or officials, usually one or more judges. The judge or panel of judges may also be collectively referred to as "the bench" (in contrast to attorneys and barristers, collectively referred to as "the bar").

In the United States, the legal authority of a court to take action is based on personal jurisdiction over the parties to the litigation and subject-matter jurisdiction over the claims asserted.