The United States Antarctic Expedition Medal is a combined military-civilian award that was authorized by the United States Congress on September 24, 1945 under Public Law 185 of the 79th Congress. The award recognizes members of the United States Antarctic Expedition of 1939–1941. There were gold, silver, and bronze versions. It is unclear if the gold version is considered a Congressional Gold Medal, as was the case with the 1st Byrd expedition.

The United States Antarctic Service Expedition (1939–1941), often referred to as Byrd’s Third Antarctic Expedition, was an expedition jointly sponsored by the United States Navy, State Department, Department of the Interior and The Treasury. Although a U.S.-government sponsored expedition, additional support came from donations and gifts by private citizens, corporations and institutions.