Roald Amundsen, the Norwegian polar explorer, or his namesakes:

Amundsen-Scott South Pole Station

HNoMS Roald Amundsen, a Fridtjof Nansen class frigate of the Royal Norwegian Navy.

Amundsen Crater, a large crater on the Moon.

CCGS Amundsen, a Canadian Coast Guard icebreaker and Arctic research ship.

Amundsen Sea, a part of the Southern Ocean beside Marie Byrd Land.

Amundsen Glacier, descending from the Queen Maud Mountains to the Ross Ice Shelf.

Amundsen - One of two probes on the NASA Deep Space 2 mission; named after polar explorer Roald Amundsen.