Port Martin, or Port-Martin, is an abandoned French research base at Cape Margerie on the coast of Adélie Land, Antarctica, as well as the name of the adjacent anchorage.

The base was established by Liotard and a team of 11 men who raised the main building with several annexes to house scientific activities.

They, in turn, were relieved on 4 January 1952 while a smaller team of seven, led by Mario Marret [fr], built a secondary base on Petrel Island, some 60 kilometres (37 mi) to the west in the Géologie Archipelago.

There were no deaths nor injuries incurred but the base personnel were evacuated to Petrel Island, where they overwintered, and Port Martin abandoned.

What remains in Port-Martin are the base's ancillary buildings, including a weather shelter and its coal and supply sheds, beneath a covering of snow.