Perjury is the criminal offense of making a false statement under oath—verbally or in writing—that the witness knows to be false and that is material to the proceeding in which the statement is made. And suborning perjury or subornation of perjury is the criminal offense of procuring the perjury of another person.

Perjury is a criminal offense under both state and federal laws and may be prosecuted as a misdemeanor or as a felony offense, depending on the state or federal jurisdiction, and whether there are any aggravating factors that increase the seriousness of the crime. Perjury laws are located in state statutes—often in the penal or criminal code—and the federal perjury law is located in the United States Code at 18 U.S.C. §1621.

In Wyoming, perjury is considered a serious criminal offense. It is defined as knowingly making a false statement under oath, whether verbally or in writing, that is material to the proceeding at hand. Wyoming statutes classify perjury as a felony, which can result in severe penalties including imprisonment and fines. The specific provisions regarding perjury can be found in the Wyoming Statutes under Title 6 (Crimes and Offenses), Chapter 5 (Offenses Against Public Administration), which outlines the elements of the crime and the associated punishments. Subornation of perjury, which involves persuading or inducing another person to commit perjury, is also a criminal offense and is treated with similar gravity under Wyoming law. At the federal level, perjury is governed by 18 U.S.C. § 1621, and like state law, it imposes strict penalties for anyone found guilty of this offense. Both state and federal laws aim to uphold the integrity of the judicial system by deterring and punishing false statements.