Ormen Långe, Apartment building in Masmo, Huddinge, Sweden.

Ormen Långe is a residential complex in Masmo (Vårby Haga), Huddinge, consisting of a winding slab house about 300 metres long and six tower blocks on Botkyrkavägen. The slab house has 9 or 10 storeys and 421 apartments in four sections; each tower block has 10 storeys and 54 apartments. The west facade has recessed balconies with red brick parapets and white balcony fronts, while entrances face Masmoberget on the east side.

The housing was built from the late 1950s to the mid-1960s to designs by architect Andreas Carstens for the municipal housing company HUGE, which still owns it. The six tower blocks at Botkyrkavägen were finished about two years before the 300-metre slab house, inaugurated in 1964. It was the first modern suburban development in Masmo.

The name Ormen Långe, "the Long Serpent", comes from the ship of the Viking king Olav Tryggvason, which the winding slab house was thought to resemble. The property was first called Solgården; the nickname became its official designation. Six mosaics and reliefs decorate the entrances on the Masmoberget side.

The complex sits at Solhagavägen 6–36 and Botkyrkavägen 1, 3, 5 in Masmo, Huddinge municipality, not Fittja. Entrances of the long slab house face east toward Masmoberget, while the balcony facade faces west. The buildings stand close to Södertäljevägen (E4/E20) and are clearly visible from the road.

The name comes from King Olav Tryggvason's ship Ormen Långe, and the property was originally called Solgården. On the east side, between the entrances facing Masmoberget, six mosaics and reliefs decorate the walls. The red brick bands and white balcony fronts are best seen from the E4/E20 passing to the west.