Sozialbau AG is a non-profit housing association based in Vienna, Austria. Founded in 1954, it has grown into a significant player in the Austrian housing market, managing over 52,000 apartments and having another 1,587 under construction as of 2022.

The organization operates as a cooperative group, overseeing several limited-profit housing cooperatives and capital companies. It is majority-owned by the Vienna Insurance Group, with additional shares held by the SPÖ-affiliated Verein Wiener Arbeiterwohnhäuser.

Sozialbau AG is known for its commitment to providing affordable housing, with average rents significantly below market value. This approach contributes to moderate housing costs in Vienna, making it a crucial part of the city's housing landscape.

The organization has also been at the forefront of innovative housing projects. Notable examples include the "Inter-ethnic Neighbourhood" project, which aimed to foster integration among residents of different ethnic backgrounds by creating a mixed community with subsidized rental accommodations. This project has been cited as a model for successful interethnic coexistence and has influenced Sozialbau's subsequent housing developments.

In addition to its housing initiatives, Sozialbau collaborates with social welfare institutions to integrate people with special needs, offering housing provision and outpatient services. This holistic approach reflects the organization's broader commitment to social responsibility and community building.

Overall, Sozialbau AG is a significant and socially engaged housing association that plays a vital role in Vienna's housing market.