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

Tyndall Glacier, also called Geikie Glacier, is one of the largest glaciers of the Southern Patagonian Ice Field, inside Torres del Paine National Park in Chile's Magallanes Region. Its main calving front stands in Geikie Lake, and like its neighbour Grey Glacier it has retreated considerably in recent years. It is named after the Irish glaciologist John Tyndall.

The glacier was named after John Tyndall, a 19th-century British scientist who made important discoveries about how ice masses move. His work contributed greatly to how people understand glacier dynamics.

The glacier carries two names: Tyndall, after the Irish glaciologist John Tyndall, and Geike, after the Scottish geologist Archibald Geikie, whose name is also given to the lake at its main front. Visitors see the calving face from the water of Geikie Lake, and the ice is often compared with its neighbour Grey Glacier, which has retreated in the same way.

Tyndall Glacier lies inside Torres del Paine National Park in the Magallanes region, with its main calving front on Geikie Lake. It has no road access and no marked trail to its front; visitors see it from the park's boat and hiking routes, and the ice is best viewed in the southern summer.

A dark line runs along the center of the glacier where two ice flows meet and carry rock and debris from the mountains. This feature clearly shows how ice from different sources moves and merges together.