Eystein Michalsen was a Norwegian architect. He graduated from the Norwegian Institute of Technology in 1917 and worked as a bricklayer until 1921.
He was the son of architect Carl Michalsen. From 1923, father and son Michalsen, along with Einar Smith, operated the architectural firm Michalsen, Smith, Michalsen in Oslo. Together with Kristian Biong, they designed the building of Den norske Creditbank in Oslo (1923–26).
From 1925, Eystein Michalsen worked in partnership with his father. Together, they designed a number of buildings in the transition between neoclassicism, art deco, and functionalism. Both the Astoria Hotel (now an office building for the Norwegian Parliament) in Oslo (1928–30) and the Student Society in Trondheim (1927–29) were awarded the Houen Foundation's Diploma in 1930 and 1931, respectively.
After his father's death in 1940, Michalsen worked as a district architect in Nordland. After the war, Michalsen served as a reconstruction architect and city planner in Bodø.
Succeeding Kaspar Hassel, Michalsen served as city architect in Bergen from 1947 to 1961. As city architect, Michalsen designed a number of school buildings in Bergen.
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