Grey Glacier, Glacier in Torres del Paine National Park, Chile

Grey Glacier lies in the Southern Patagonian Ice Field just west of the Cordillera del Paine, on the western side of Torres del Paine National Park, and flows south into Grey Lake. Before splitting into two fronts, it is 6 km wide and over 30 m high. Its surface is broken into jagged pinnacles, ridges and deep crevasses in pale blue, white and grey; the lower face forms a steep wall above the water, where detached ice blocks float.

This glacier formed during the last ice age several tens of thousands of years ago as part of a vast ice field spanning Patagonia. Over time it has retreated and transformed, with large sections regularly breaking away and falling into the lake below.

The glacier's name comes from the Grey Lake it feeds, and its meltwater turns grey from rock flour ground beneath the ice. Visitors reach the south shore of the lake by the Paine circuit trail or by boat, where floating ice fragments gather near the shore and the glacier stands in the background.

Grey Glacier sits on the west side of Torres del Paine National Park, at the south end of the Southern Patagonian Ice Field. The lake surface and the glacier can be seen from John Garner Pass on the Paine Mountain Range circuit, and from the lake's south shore, where floating ice fragments gather near the water's edge. The glacier is retreating, and calving ice is commonly seen near the site.

In November 2017 a large iceberg broke off Grey Glacier. The glacier's grey colour comes from rock flour: ice grinding the bedrock produces fine particles that tint the meltwater grey. Its blue tones result from ice absorbing red wavelengths and scattering blue light.