A vacated judgment makes a previous legal judgment legally void. A vacated judgment is usually the result of the judgment of an appellate court, which overturns, reverses, or sets aside the judgment of a lower court. An appellate court may also vacate its own decisions.
A trial court may have the power under certain circumstances, usually involving fraud or lack of jurisdiction over the parties to a case, to vacate its own judgments.
A vacated judgment may free the parties to civil litigation to re-litigate the issues subject to the vacated judgment.
Another means of having a vacated judgment would be if the defendant dies prior to all appeals being exhausted. Notable defendants having their convictions vacated under this include Kenneth Lay (the former Chairman/CEO of Enron who died before sentencing) and Aaron Hernandez (the former football player who killed himself in jail before his appeals were exhausted). In March, 2019, the vacated judgment of Aaron Hernandez was itself overturned, and his murder conviction upheld. 
"Relief from judgment" of a United States District Court is governed by Rule 60 of the Federal Rules of Civil Procedure. The United States Court of Appeals for the Seventh Circuit noted that a vacated judgment "place[s] the parties in the position of no trial having taken place at all; thus a vacated judgment is of no further force or effect."
One form of a vacatur in the United States legal system was established by United States v. Munsingwear, Inc. 340 U.S. 36 (1950), otherwise known as the Munsingwear vacatur. This approach is used when while a case is being held on appeal, whether at the Circuit Court or Supreme Court level, underlying factors make the case moot, then the higher court will vacate the lower court's ruling, send the case back to the lower court, and have them render the case moot. Certain conditions must be met before the higher court can give a Munsingwear vacatur, generally allowing this vacatur to be used in three situations: in the matter of "happenstance" (such as the death of a litigant), through a settlement of the parties, or a unilateral action by the prevailing party from the lower court.
- Central Park jogger case
- Jury nullification
- Kenneth Lay
- Remand (court procedure)
- Abatement ab initio
- Tony Marco; Ray Sanchez. "Aaron Hernandez's murder conviction reinstated by high court". CNN.
- Federal Rules of Civil Procedure (Dec. 1, 2012)
- United States v. Williams, 904 F.2d 7, 8 (7th Cir. 1990) (citations removed).
- Millett, Pattie (June 10, 2008). "Practice Pointer: Mootness and Munsingwear Vacatur". SCOTUSblog. Retrieved November 5, 2018.
- Schoen, David (April 3, 2014). "Consequences of Mootness on Appeal". American Bar Association. Retrieved November 5, 2018.