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Antarctic Long-Finned Whale is an unknown cetacean of the Antarctic. Length, 20–30 feet. Black. Long, erect, slightly curved dorsal fin situated toward the tail.

In 1841, commander of the Erebus James C. Ross and surgeon Robert McCormick reported seeing a high-finned whale in the Ross Sea off Ross Island, Antarctica.

Zoologist Edward A. Wilson observed groups of similar cetaceans on January 28 and February 8, 1902, during Robert Scott’s Discovery expedition to the Antarctic. They were black, with some white around the mouth or chin. The dorsal fins were 3–4 feet long and sabre-shaped.

Cetologist Robert Clarke and colleagues logged eight sightings of a high-finned mystery whale about 20 feet long off the coast of Chile, November 24–27, 1964.