Rautatalo (Swedish: Järnhuset) is an office building in central Helsinki, Finland, completed in 1955, and notable for having been designed by the Finnish architect Alvar Aalto.

[2] The exterior character of the building is dark and austere, clad with copper plate on its main façade and brown brick on the side elevation.

[3] It was designed to match the height and proportions of the earlier building, created in classical style by Eliel Saarinen, which it abuts on one side (seen in the photo on the right).

[2][1] In contrast to the exterior, the interior is light and airy, making extensive use of white Carrara marble and travertine.

[1] At the heart of the interior space is an enclosed atrium,[3] naturally-lit through 40 skylights,[4] known as Marmoripiha ('Marble Courtyard'),[4] with its design inspired by Mediterranean architecture.