The United States District Court for the District of Montana (in case citations, D. Mont.) is the United States District Court whose jurisdiction is the state of Montana (except the part of the state within Yellowstone National Park, which is under the jurisdiction of the United States District Court for the District of Wyoming). The court is located in Billings, Butte, Great Falls, Helena and Missoula.

Cases from the District of Montana are appealed to the United States Court of Appeals for the Ninth 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 Montana represents the United States in civil and criminal litigation in the court. The current U.S. Attorney for the District of Montana is William W. Mercer.

Judges