Knud Johan Victor Rasmussen (June 7, 1879–December 21, 1933) was a Greenlandic polar explorer and anthropologist. He has been called the "father of Eskimology" and was the first to cross the Northwest Passage via dog sled.

Rasmussen was born in Jakobshavn, Greenland, the son of a Danish missionary and Inuit mother. He spent his early years in Greenland among the Inuit where he learned from an early age to speak the language, hunt, drive dog sleds and live in harsh Arctic conditions. "My playmates were native Greenlanders; from the earliest boyhood I played and worked with the hunters, so even the hardships of the most strenuous sledge-trips became pleasant routine for me." He was later educated in Lynge, North Zealand, Denmark. Between 1898 and 1900 he pursued an unsuccessful career as an actor and opera singer.

He went on his first expedition in 1902–1904, known as "The Literature Expedition", with Jørgen Brønlund, Harald Moltke and Ludvig Mylius-Erichsen, to examine Inuit culture. After returning home he went on a lecture circuit and wrote The People of the Polar North (1908), a combination travel journal and scholarly account of Inuit folk-lore. In 1908 he married Dagmar Andersen.

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