Þorsteinn

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