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