Stefansson or Stefánsson is a surname of Icelandic origin, meaning son of Stefán. In Icelandic names, the name is not strictly a surname, but a patronymic. The name may refer to:
Baldur R. Stefansson (1917–2002), Canadian agricultural scientist; known as the Father of Canola
Davíð Stefánsson (1895–1964), Icelandic poet
Hannes Stefansson (b. 1972), Icelandic chess grandmaster
Hermann Stefánsson, Icelandic author
Ívar Stefánsson (b. 1927), Icelandic cross-country skier
Janne Stefansson (b. 1935), Swedish Olympic cross-country skier
Jón Arnór Stefánsson (b. 1982), Icelandic professional basketball player
Jón Kalman Stefánsson (b. 1963), Icelandic author
Kári Stefánsson (contemporary), Icelandic physician and professor of neurology; co-founder of deCODE Genetics
Ólafur Stefánsson (b. 1973), Icelandic professional handball player
Sigurd Stefánsson, the author of the historical Skálholt Map
Stefán Jóhann Stefánsson (1894–1980), Icelandic politician; prime minister of Iceland 1947–49
Stefán Karl Stefánsson (b. 1975), Icelandic film and stage actor
Vilhjalmur Stefansson (1879–1962), Canadian Arctic explorer and ethnologist
