Þorsteinn is an Old Norse and Icelandic masculine given name. Notable people with the name include:
- Þorsteinn Bachmann (born 1965), Icelandic actor
- Þorsteinn Bjarnason (born 1957), Icelandic former professional footballer (goalkeeper)
- Þorsteinn Eiríksson, the youngest son of Erik the Red
- Þorsteinn Erlingsson (1858–1914), Icelandic poet
- Þorsteinn frá Hamri (born 1938), Icelandic writer
- Þorsteinn Gunnarsson (born 1940), Icelandic actor and architect
- Þorsteinn Gylfason (1942–2005), Icelandic philosopher, translator, musician, poet, art enthusiast and intellectual
- Þorsteinn J (full name Þorsteinn Jens Vilhjálmsson), an Icelandic television personality
- Þorsteinn Pálsson (born 1947), Prime Minister of Iceland for the Independence Party from 1987 to 1988
This page or section lists people that share the same given name.
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