Köln Hauptbahnhof (English: Cologne Central Station) is the central railway station of Cologne, Germany. The station is an important local, national and international transport hub, with many ICE, Eurostar and Intercity trains calling there, as well as regional Regional-Express, RegionalBahn and local S-Bahn trains. EuroNight and Nightjet night services also call at the station. It has frequent connections to Frankfurt by way of the Cologne–Frankfurt high-speed rail line, which starts in southern Cologne. On an average day, about 280,000 travellers frequent the station, making it the fifth busiest station in Germany.

The station is situated next to Cologne Cathedral.

There is another important station in Cologne, the Köln Messe/Deutz station across the river Rhine, just about 400 metres away from Köln Hauptbahnhof. The stations are linked by the Hohenzollern Bridge, a six-track railway bridge with pedestrian and bicycle lanes on each side. Frequent local services connect the two stations.

By 1850 there were five stations at Cologne that had been built by different railway companies. On the west bank of the Rhine there were the Bonn-Cologne Railway Company (German, old spelling: Bonn-Cölner Eisenbahn-Gesellschaft, BCE), the Cologne-Krefeld Railway Company (German, old spelling: Cöln-Crefelder Eisenbahn-Gesellschaft, CCE) and the Rhenish Railway Company (German: Rheinische Eisenbahn-Gesellschaft, RhE). On the east bank there were the Bergisch-Märkische Railway Company (German: Bergisch-Märkische Eisenbahn-Gesellschaft, BME) and the Cologne-Minden Railway Company (German, old spelling: Cöln-Mindener Eisenbahn-Gesellschaft, CME).

In 1854 a controversial decision was taken to locate a new rail and road bridge next to the cathedral, following consideration of such proposals as connecting the bridge to an existing freight yard and temporary passenger station on the banks of the Rhine (Rhine Station) at the street of Trankgasse, which is to the southeast of the current Hauptbahnhof. It was suggested that carriages could be lowered by lift to the Trankgasse station, but it was quickly realized that the only effective way for connecting the left and right bank line was to create a central station. The city agreed to the proposal in 1857 and made available the ground of the former Botanical garden to the north of the cathedral and on the site of part of the old University of Cologne, suppressed by the French in 1798. The railway track was laid at ground level from the bridge over the Rhine and crossing the street of Eigelstein west of the station at ground level and running through the medieval city wall.

The original Central Station (German: Centralbahnhof) was built beginning in 1857 to the plans of Hermann Otto Pflaume on behalf of the RhE, which had in the same year acquired the BCE. The station was opened on 5 December 1859 together with the Cathedral Bridge (German: Dombrücke, later the site of the Hohenzollernbrücke). The Central Station was a combined terminus and through station: it included four terminating tracks for the RhE running to the west, while the CME had two through tracks connected to its line on the eastern side of the Rhine by the Cathedral Bridge.

The station quickly reached capacity, but the RhE as operator had only limited interest in developing the station, as this would have mainly benefited competing companies. Serious planning for an enlarged station was therefore only taken after the nationalisation of the railways in Prussia in the 1880s.

For the planning of the new central station two options were considered: