Arenite Ridge (69°41′S 69°32′W) is a steep-sided rock and snow ridge in northern Alexander Island, Antarctica. It extends approximately 15 nautical miles (28 km) in a north–south direction, lying immediately west of the Douglas Range and forming the eastern wall of the Toynbee Glacier. The ridge includes two notable summits: Mount Tyrrell (which has two summits) and Mount Tilley.
The feature was named by the UK Antarctic Place-Names Committee in 1977 after the sandstone-type rocks (arenite) that compose the ridge. The term "arenite" itself refers to a sedimentary rock composed of sand-sized grains, which is fitting given the geological composition of the formation.
Arenite Ridge is located within the Antarctic Treaty area and is recorded in the Geographic Names Information System of the United States Geological Survey.
