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Oyer redirects here. For the county in Norway, see Øyer

Oyer and terminer is the Anglo-French name, meaning to hear and determine, for one of the commissions by which a judge of assize sits; it is also known as audiendo et terminando. By the commission of oyer and terminer the commissioners (in practice the judges of assize, though other persons are named with them in the commission) are commanded to make diligent inquiry into all treasons, felonies and misdemeanours whatever committed in the counties specified in the commission, and to hear and determine the same according to law. The inquiry is by means of the grand jury; after the grand jury has found the bills submitted to it, the commissioners proceed to hear and determine by means of the petit jury. The words oyer and terminer are also used to denote the court which has jurisdiction to try offences within the limits to which the commission of oyer and terminer extends.

Created by Governor Will Phips, Oyer and Terminer was designed for the Salem Witch Trials and was dissolved in 1693 when the trials were reflected upon and disapproved. One of the courtmen, Increase Mather stated that, "It is better that 10 suspected witches escape than that one innocent person killed."

By the Treason Act of 1708, the crown has power to issue commissions of oyer and terminer in Scotland for the trial of treason and misprision of treason. Three of the lords of justiciary must be in any such commission. An indictment for either of the offences mentioned may be removed by certiorari from the court of oyer and terminer into the court of justiciary.

In the United States oyer and terminer is the name given to courts of criminal jurisdiction in some states, e.g. New York, Pennsylvania, and Georgia.

• This article incorporates text from the Encyclopædia Britannica Eleventh Edition, a publication now in the public domain.