Snorri Thorfinnsson (Old Norse and Icelandic: Snorri Þorfinnsson or Snorri Karlsefnisson) probably born between 1004 and 1013, and died c. 1090) was the son of explorers Þorfinnur Karlsefni and Guðríður Þorbjarnardóttir. He is considered to be the first white child to be born in the Americas, apart from Greenland. He became an important figure in the Christianisation of Iceland.
Snorri is an Old Norse name derived from the word , meaning "a fight." Þorfinnsson is a patronymic, meaning "son of Þorfinnr", (see Icelandic naming conventions). Snorri was named for his great-grandfather, Snorri Þórðarson, or after Snorri Þorbrandsson who was not a kinsman but a participant in Karsefni's expedition
There is speculation about the birth date of Snorri Thorfinnsson. Birth years such as 1005, 1009, and 1012 have been postulated, but all sources agree that he was born between 1005 and 1013. According to the Vinland sagas, when Snorri was 3 years old, his family left Vinland because of hostilities with indigenous peoples (called Skrælings by the settlers, meaning "barbarians"). The family returned to the Glaumbær farm in Seyluhreppur.
Snorri Thorfinnsson had two children; a daughter named Hallfrid, and a son named Thorgeir. Hallfrid was the mother of Thorlak Runolfsson, bishop of Skálholt in the south of Iceland. One of the descendants of Snorri's brother Thorbjorn, Bjorn Gilsson, was also a bishop of Hólar. Thorgeir was the father of Yngvild who was the mother of Brand Sæmundarsson, bishop of Hólar. The sculptor Bertel Thorvaldsen claimed descent from Snorri Thorfinnsson in the 19th century.