Herman Munthe-Kaas (25 May 1890 – 5 May 1977) was a Norwegian architect. Herman Munthe-Kaas was primarily known for his Functionalist building designs.
Together with Gudolf Blakstad, he started the architectural firm Blakstad and Munthe-Kaas Architects in 1922. The firm discontinued a few years after Gudolf Blakstad death in 1989. The firm collaborated on several significant assignments in Norway including Kunstnernes Hus for which they were awarded the Houens fonds diplom in 1931.
Their work also included the City Hall in Haugesund (1931), Elgeseter Bridge (1951) in Trondheim, Bodø Cathedral (1956) in the Diocese of Sør-Hålogaland and Alfaset chapel (1972) in Oslo.