Ivar Justus Tengbom (April 7, 1878 – August 6, 1968) was a Swedish architect and one of the best-known representatives of the Swedish neo-classical architecture of the 1910s and 1920s. Tengbom was born in in Jönköping County, studied at the Chalmers School of Technology in Gothenburg 1894-1898, at the architecture school of the Royal Swedish Academy of Arts in Stockholm 1898-1901 (being awarded the so-called Royal Medal) and abroad 1905-1906. He worked 1906-1912 with in Stockholm and Gothenburg 1906-1912, and on his own from 1912 in Stockholm. He was appointed architect in the Office of the Chief Intendant in 1906 and professor of architecture in the in 1916. He became a member of the Royal Swedish Academy of Arts in 1917. In 1921 he was appointed Director General of the State Office of