Fridtjof Nansen (1861–1930) was a Norwegian polar explorer, scientist, diplomat, humanitarian, and Nobel laureate.

Nansen may also refer to:

• Nansen (surname)
• Nansen Fugan, the Japanese name for the Tang dynasty Chan (Zen) Buddhist master Nanquan Puyuan

• Fridtjof Nansen-class frigate, the main surface combatant units of the Royal Norwegian Navy
• HNoMS Fridtjof Nansen (1930), a Norwegian coast guard ship
• HNoMS Fridtjof Nansen (F310), a 2004 frigate of the Royal Norwegian Navy

• Cape Nansen, headland in the Greenland Sea, east Greenland
• Mount Nansen (Antarctica)
• Mount Fridtjof Nansen, Antarctica
• Mount Nansen (Yukon) in Yukon, Canada
• Nansen Island (disambiguation)
• Nansen Land, Greenland
• Nansen (lunar crater)
• Nansen (Martian crater)
• Nansen Sound, a strait in Nunavut, Canada, between Ellesmere Island and Axel Heiberg Island
• Fridtjof Nansen Peninsula, SE Greenland

• Nansen International Office for Refugees (French: Office international Nansen pour les réfugiés), a 1930–1939 League of Nations organization
• Nansen Institute, an independent research foundation in Norway
• Nansenhjelpen, also known as Nansen Relief in English, a Norwegian humanitarian organisation

• The Nansen Refugee Award
• Nansen (biography), a 1940 children's biography of the explorer by Anna Gertrude Hall
• Nansen (cat), ship's cat on Belgica during the Belgian Antarctic Expedition in 1897–98
• Nansen passport, internationally recognized identity cards first issued by the League of Nations to stateless refugees
• Nansen bottle, an oceanographic sampling device

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