Steen Eiler Rasmussen (1898–1990) was a Danish architect and urban planner who was a professor at the Royal Danish Academy of Fine Arts, and a prolific writer of books and poetry. He was made a Royal Designer for Industry by the British Royal Society of Arts in 1947.
Steen Eiler Rasmussen was born on 19 February 1898 in Copenhagen to Lieutenant colonel and later general Christian Rasmussen and Anna Dorthea (Dori) Jung. He first apprenticed as a mason and then studied architecture at the Royal Danish Academy of Fine Arts from 1916 to 1918. In 1919 he set up his own practice.
Rasmussen was a lecturer at the Academy from 1924 and became a professor in 1936. Among his students were Jørn Utzon, designer of the Sydney Opera House, and Marian Pepler who designed rugs for Gordon Russell in the 1930s .