 The Supreme Court of Guam is the ultimate judicial authority on local matters.Appeals of questions involving the U.S. Constitution or federal laws or treaties are heard by a three-judge appellate panel of the U.S. District Court of Guam.The Court sits in the Monessa G. Lujan Memorial Courtroom, which is on the third floor of the Guam Judicial Center in Hagatna, Guam

The Court is composed of three justices who are appointed by the Governor of Guam and confirmed by the Guam Legislature.