Riksförsäkringsanstalten, Governmental listed building complex in Stockholm, Sweden.

Riksförsäkringsanstalten is an office building by Adolf Fredrik's Church on Norrmalm in Stockholm, designed by Sigurd Lewerentz and built 1930–1932. Its six storeys and set-back attic storey form a smooth-rendered cube, with sparse, deeply recessed square windows on the street facades. The main entrance on Adolf Fredriks kyrkogata is reached through an oval inner courtyard whose facades curve softly, with windows set in long bands.

The building was designed by Sigurd Lewerentz after he won an invited architectural competition held by the Byggnadsstyrelsen in 1928. The agency's old premises at Auditorium near Norra Bantorget had become too cramped and failed fire-safety requirements. Lewerentz received the direct commission to develop his proposal, and the building was constructed between 1930 and 1932. It was declared a listed building on 1 October 1993.

The building shows how Swedish government architecture looked in the 1930s, with its straightforward design and clear organization of spaces. Inside, the original room layouts remain as they were designed to serve insurance administration work.

The building sits in central Stockholm and is easy to reach on foot from public transport hubs. The area around it connects to other government facilities and the city center.

The name means National Insurance Institution and directly refers to its original purpose as the hub for Sweden's then-new social insurance system. The building itself became an example of how modern architecture could express the values of a welfare state.