United States v. Throckmorton (98 U.S. 61) is an 1878 decision of the U.S. Supreme Court on civil procedure, specifically res judicata, in cases heard at equity. A unanimous Court affirmed an appeal of a decision by the District Court for California upholding a Mexican-era land claim, holding that collateral estoppel bars untimely motions to set aside the verdict where the purportedly fraudulent evidence has already been considered and a decision reached. In the opinion it distinguished between that kind of fraud, which it called intrinsic, and extrinsic fraud, in which deceptive actions exterior to the proceeding prevented a party, or potential party, to the action from becoming aware of the possibility they could vindicate their rights in court.