Flemming Lassen (1902 – 1984) was a Danish architect and designer, working within the idiom of the International Style and Functionalism. In the 1930s and early 1940s, with his unconventional curved designs, Flemming Lassen contributed to the development of the Danish modern style - always having his focus on simple and clearly defined lines. Lassen also designed lamps and silverware and some notable libraries and cultural centres in Denmark.
Flemming Lassen was born into an artistic family. He was the brother of Mogens Lassen (1901-1987), also an important architect in the functionalism in Denmark. Their father Hans Vilhelm Lassen was a decorative painter and their mother Ingeborg Winding was a painter.
Flemming Lassen trained as a mason before completing his education at the Technical School. In the 1930s, after working at a number of different architecture studios, Lassen set up office with Arne Jacobsen with whom he in 1929 had won the competition of Danish Architects Association for designing the "House of the Future" (1929). Their project was built full scale at the subsequent exhibition in Copenhagen’s Forum, it was a spiral-shaped, flat-roofed house in glass and concrete, incorporating a private garage, a boathouse and a helicopter pad. Other striking features were windows that rolled down like car windows, a conveyor tube for the mail and a kitchen stocked with ready-made meals.