Thorfinnsson is an Icelandic patronymic surname. Notable people with the surname include:
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Björn Thorfinnsson (born 1979), Icelandic chess player and journalist
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Bragi Þorfinnsson (born 1981), Icelandic chess grandmaster
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Paul and Erlend Thorfinnsson
Paul Thorfinnsson (died 1098) and Erlend Thorfinnsson (died 1098) were brothers who ruled together as Earls of Orkney. Paul and Erlend were the sons of Thorfinn Sigurdsson and Ingibiorg Finnsdottir. Through Ingibiorg's father Finn Arnesson an ...
; Paul (died after 1098) and Erlend (died 1098) ruled together as Earls of Orkney
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Snorri Thorfinnsson
Snorri Thorfinnsson (Old Norse and Icelandic: Snorri Þorfinnsson or Snorri Karlsefnisson; most likely born between 1004 and 1013, and died ''c.'' 1090) was the son of explorers Thorfinn Karlsefni and Gudrid Thorbjarnardóttir. He is considere ...
(born between 1005 and 1013), the first European to be born in North America
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