Icebreaker Glacier (73°37′S166°10′E) is a large valley glacier 10 miles (16 km) northeast of Mount Monteagle that flows southeast from the Mountaineer Range to Lady Newnes Bay, Victoria Land, Antarctica. Below Hermes Point its flow coalesces with that of Fitzgerald Glacier. The glacier was named by the New Zealand Geological Survey Antarctic Expedition, 1958–59, as a tribute to the work of the complements of U.S. Navy, and U.S.