Headquarters of the National Social Insurance Institute, Art Deco administrative building in District VIII, Hungary

The headquarters of the National Social Insurance Institute stands at Fiumei út 19 in Budapest's District VIII, built in 1912–1913 to designs by Marcell Komor and Dezső Jakab. The structure is made of bauxite concrete, and a wing added in 1930–1931 brought a 73-metre, 18-storey tower, later demolished in 1969 so that an 11-storey stump remains.

The building was constructed in 1912–1913 as the Budapest District Workers' Insurance headquarters, designed by Marcell Komor and Dezső Jakab in Art Deco style using bauxite concrete. In 1927 it became the seat of the newly founded National Social Insurance Institute. A new wing and a 73-metre, 18-storey tower were added in 1930–1931 to the same architects' plans. The tower was demolished in 1969 for safety reasons, leaving an 11-storey stump; the building was restored after 1945 and renovated in 2002–2004.

The building was first called the Budapest District Workers' Insurance Headquarters, and from 1927 it housed the National Social Insurance Institute. Its 73-metre, 18-storey tower earned it the nickname "Budapest's first skyscraper". The tower was demolished in 1969 for safety reasons, leaving an 11-storey stump. Today the building houses the Hungarian State Treasury's social insurance and family support department and the Budapest Government Office's pension insurance division.

The building is located in District VIII, an area served by streetcar lines and nearby bus stops. The location is fairly easy to reach by public transport, though it lacks its own parking facilities.

The 73-metre, 18-storey tower added in 1930–1931 earned the building the nickname "Budapest's first skyscraper". It was demolished in 1969 for safety reasons, leaving an 11-storey stump that visitors still see above the Fiumei Road wing.