The Byrd Glacier is a major glacier in Antarctica, about 136 km (85 mi) long and 24 km (15 mi) wide. It drains an extensive area of the Antarctic plateau, and flows eastward to discharge into the Ross Ice Shelf.

The Churchill Mountains is a major range of mountains and associated elevations bordering the western side of the Ross Ice Shelf, between Byrd Glacier and Nimrod Glacier. They are south of the Britannia Range and north of the Geologists Range, Miller Range and Queen Elizabeth Range.