Ragnar Dahl was a Norwegian architect.
Dahl was educated at the Norwegian National Academy of Craft and Art Industry before completing his architecture studies in Sweden. He worked at the City Architect's Office before establishing his own practice in Christiania (now Oslo). Throughout his career, Dahl designed various types of buildings in Oslo (including the former Aker district) and Moss, including residences, industrial buildings, commercial properties, libraries, and more. Dahl's buildings showcase a range of architectural styles typical of his time, including Art Nouveau, Neo-Baroque, and Functionalism.