Studio BBPR was an architectural and design studio established in Milan in 1932 among four Politecnico di Milano architects: Gian Luigi Banfi (1910, Milan–1945, Gusen-Mauthausen Concentration Camp in Austria), Lodovico Barbiano di Belgiojoso (1909, Milan–2004, Milan), Enrico Peressutti (1908, Pinzano al Tagliamento–1976, Milan), and Ernesto Nathan Rogers (1909, Trieste–1969, Brescia). The first letters of the last names of each made up the acronym by which the BBPR Architects was founded.

Their initial work as BBPR partners followed the themes of Italian rationalism in the 1930s. Even if the architects were not an integral part of the rationalist movement, as they were of a slightly later generation, BBPR became an influential artistic and intellectual entity of Italian rationalism, which had its roots, not unlike fascism, in classical philosophy and embraced the concept of the “ideal” proportions.