Þorsteinn
Þorsteinn is an Old Norse and Icelandic masculine given name. Notable people with the name include:
- Þorsteinn Eiríksson, the youngest son of Erik the Red
- Þorsteinn Erlingsson, Icelandic poet
- Þorsteinn Gylfason, Icelandic philosopher, translator, musician, poet, art enthusiast and intellectual
- Þorsteinn frá Hamri, Icelandic writer
- Þorsteinn Gunnarsson, Icelandic actor and architect
- Þorsteinn Pálsson, Prime Minister of Iceland for the Independence Party from 1987 to 1988
- Þorsteinn Bjarnason, Icelandic former professional footballer
- Þorsteinn Bachmann, Icelandic actor
- Þorsteinn J, an Icelandic television personality