Sigurd Lewerentz (29 July 1885 in Sando, Sweden - 29 December 1975 in Lund, Sweden) was an architect, initially trained as a mechanical engineer at the Chalmers University of Technology in Gothenburg (1905-8). Later he took up an architectural apprenticeship in Germany. He first opened his own office in Stockholm in 1911, and through his association with Gunnar Asplund became involved with the design of cemetery.

Together they made a winning entry for the Stockholm South (Woodland) Cemetery competition of 1914-15. This project was implemented initially by both architects, however, the latter stages were done by Asplund alone. He and Asplund were appointed as the main architects for the Stockholm International Exhibition (1930) but afterwards Lewerentz became disillusioned, Lewerentz turned away from architecture for many years, and from 1940 he ran a factory producing windows and other architectural fittings of his own design.

Sigurd Lewerentz, together with his colleagues Erik Lallerstedt and David Hellden, created what is regarded of one of the masterpieces of functionalist architecture, Malmo Opera and Music Theatre. The foyer is considered of particular beauty, with its open surfaces and beautiful marble staircases and it is adorned with a number of works of art by artists such as Carl Milles and Isaac Grunewald.

In the last decade of his life he designed two churches, St. Mark's, Bjorkhagen, Stockholm (1956) and St. Peter's, Klippan (1963), that revived his career in architecture. He continued to work at competition proposals and furniture designs until shortly before his death.