Transition Glacier () is a glacier on the east coast of Alexander Island, 8 nautical miles (15 km) long and 2 nautical miles (3.7 km) wide, which flows east to George VI Sound along the north side of Block Mountain and Tilt Rock. First photographed from the air on November 23, 1935, by Lincoln Ellsworth and mapped from these photos by W.L.G. Joerg. Surveyed in 1949 by the Falkland Islands Dependencies Survey (FIDS), and so named by them because this glacier marks the transition between igneous rocks to the north and sedimentary rocks to the south.
This article incorporates public domain material from the United States Geological Survey document "Transition Glacier" (content from the Geographic Names Information System).