KF-huset, Office complex at Stadsgården, Stockholm, Sweden.

KF-huset is an office complex at Stadsgården 2–12 on Södermalm in Stockholm, built in stages for the Kooperativa förbundet. Its oldest part, by Gustaf Wickman (1909–1912), is a heavy brick building with a plastered baroque-style facade facing Katarinavägen. In front of it stand five linked wings in light marble by Eskil Sundahl and Olof Thunström (1934–1936), and to the east Jan Lunding added a glass curtain-wall block in 1972–1974.

Gustaf Wickman designed the first office and residential building in heavy brick, erected 1909–1912 and still showing its plastered baroque facade toward Katarinavägen. In 1934–1936 Eskil Sundahl and Olof Thunström of the cooperative's own office KFAI added five linked wings in light marble, and Wickman's house was raised by two floors with a roof terrace. Jan Lunding's glass house followed in 1972–1974 on the site of the demolished Drottsgården.

The complex is green-marked by the Stockholm City Museum, meaning the buildings are judged particularly valuable from historical, cultural-historical, environmental or artistic points of view. The name KF-huset comes from Kooperativa förbundet, the cooperative movement that built it; the newer name Katarinahuset has no historical roots. The rounded corner at Slussen connects to Katarinahissen, and the Katarina footbridge spans 26 metres over Katarinavägen.

The complex faces Stadsgården 2-12 on Södermalm, beside Slussen and Katarinavägen. Katarina gångbro, a 26-metre footbridge, crosses Katarinavägen between Urvädersgränd and the office roof, linking to the Katarinahissen walkway. The rounded corner at Slussen and Katarinavägen is where the lift connects to the offices.

The glass structure from the 1970s features an integrated heating system within its illuminated facade, an innovative solution for energy efficiency. This technical detail is a rare feature of architecture from that era.