Butzweilerhof, Historic airport complex in Ossendorf, Germany.

Butzweilerhof is a former airport in Ossendorf, Cologne. Its 1935–36 complex, designed by Hans Mehrtens, is about 270 metres long and slightly curved along the circular airfield. The two-storey passenger building has a lobby aligned with the old airport road; its landside portal carries a relief by Willi Meller showing the Weimar eagle and three crowns from Cologne's coat of arms. A horseshoe-shaped workshop yard, Hangar I (68.4 by 34.8 metres) and a Bauhaus-style control tower complete the group.

The Imperial Army established an air station here in 1912, fully operational by spring 1913; Manfred von Richthofen took a flight-observer course in June 1915. After the RAF left in 1926, Konrad Adenauer backed the civil airport, opened on 16 May 1926. The 1935-36 complex, built by 1,100 unemployed workers, opened in June 1936; traffic peaked in 1938 with 6,390 departures and 49,938 passengers.

The site reflects New Objectivity design principles, where modernist forms merge with practical purposes through its tower, hangars, and office spaces. Visitors can see how function shaped every architectural choice here.

The complex is now open for visits and houses businesses and offices in its restored buildings. The grounds are best explored on foot, allowing time to see the different structures and outdoor areas.

The passenger lobby's landside portal carries a relief by sculptor Willi Meller showing the Weimar Republic eagle and three crowns from Cologne's coat of arms. Arriving passengers who left the building toward the landside looked straight at Cologne Cathedral in the distance. The 1935-36 buildings, designed by Hans Mehrtens, are listed monuments.