Vyborg Library is a library in Vyborg, Russia, built during the time of Finnish sovereignty, before the Finnish city of Viipuri was annexed by the former USSR and its Finnish name was changed to Vyborg by the USSR authorities.
The building, built from 1927 to 1935, is an internationally acclaimed design by the Finnish architect Alvar Aalto and one of the major examples of 1920s functionalist architectural design. The library is considered one of the first manifestations of "regional modernism". It is particularly famous for its wave-shaped ceiling in the auditorium, the shape of which, Aalto argued, was based on acoustic studies. On completion the library was known as Viipuri Library, but after the Second World War and Soviet annexation, the library was renamed the Nadezhda Krupskaya Municipal Library. Nowadays, integrated in the Russian Federation city of Vyborg, the library is officially known as the Central City Alvar Aalto Library.