The United States District Court for the District of Wyoming (in case citations, D. Wyo.) is the federal district court whose jurisdiction comprises the state of Wyoming and those portions of Yellowstone National Park situated in Montana and Idaho; it is the only federal court district that includes portions of more than one state, creating a possible "Zone of Death" where it would be difficult to prosecute crimes. The court has locations in Cheyenne and Casper.
Appeals from this court are heard by the United States Court of Appeals for the Tenth Circuit (except for patent claims and claims against the U.S. government under the Tucker Act, which are appealed to the Federal Circuit).
The United States Attorney's Office for the District of Wyoming represents the United States in civil and criminal litigation in the court. As of , the acting United States attorney is Darin Smith.
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Law professor Brian C. Kalt has argued that it may be impossible to impanel a jury in compliance with the Vicinage Clause of the Sixth Amendment to the United States Constitution for a crime committed solely in the Idaho portion of Yellowstone National Park (and that it would be difficult to do so for a crime committed solely in the Montana portion). This has been referred to as the Zone of Death.
U.S. attorneys for Wyoming including the Wyoming Territory: