Þorsteinn Bachmann (born 25 October 1965) is an Icelandic actor. He is known for his role as Móri in Life in a Fishbowl. In 2015 he won an Edda Award for that same role.

Bachmann grew up in the Fossvogur area of Reykjavík, Iceland before moving to Breiðholt when he was 10 years old. He did not do well in school in the early years. Looking back he remembers, that he was barely able to read or write before changing schools from Fossvogur to the one in Breiðholt.