Thorsteinsson and Thorsteinsen are patronymic surname of Scandinavian origin, meaning son of Thorsteinn. The names may refer to:
Thorsteinsson
edit- Björn Thorsteinsson (born 1940), Icelandic chess master
- Raymond Thorsteinsson, Canadian geologist of the Arctic regions
- Steingrímur Thorsteinsson (1831–1913), Icelandic poet, author, and translator
- Thorbjorn Thorsteinsson (died 1158), Orcadian (of Orkney) pirate
Thorsteinsen
edit- Cecilie Thorsteinsen, Norwegian team handball player