Wien-Süd is a non-profit housing cooperative based in Vienna, Austria, with a long history dating back to the early 20th century. It is part of Vienna's tradition of social housing, which has been a cornerstone of the city's urban development policy. The organization's roots lie in the labor movement, aiming to provide affordable housing for all sections of the population, regardless of income level.

Wien-Süd has developed several residential areas in Vienna, focusing on energy efficiency and community living. For example, the Eduard-Kittenberger-Gasse project in the 23rd district features 370 units built to low-energy standards, with solar panels and green spaces. Another notable project is the Biotope City Wienerberg, a multistorey development certified as "Greenpass Platinum" for its innovative urban design and environmental sustainability.

The organization's scope of activities includes not only building and managing housing but also creating liveable spaces that foster community interaction. This includes incorporating amenities such as sound-proofed music rooms, secure bicycle parking, and rooftop gardens. Wien-Süd's projects are designed to be mixed tenure, offering a range of housing options from sale to rent, including SMART apartments for very low-income households.

Wien-Süd's commitment to social housing reflects Vienna's broader urban development strategy, which emphasizes affordable housing, community engagement, and environmental sustainability. The organization's projects contribute to Vienna's reputation as a model for social housing, demonstrating how high-quality, affordable living spaces can be achieved through careful planning and community-focused design.