European route E37

European route E 37 is a series of roads in Germany, that is part of the United Nations International E-road network.
It runs from Bremen to Cologne (), both in Germany.
The route leaves Bremen, where it connects to the E 22, the E 233 and the E 234. It then heads immediately south-west, with the first major settlement it passes through being Osnabrück in the German state of Lower Saxony (), where it links with the European Route E 30. It then heads south, entering North Rhine-Westphalia () and passing through the city of Dortmund and connecting to the E 34, the E 41 and the E 341.
It then heads south through North Rhine-Westphalia, reaching its final destination of Cologne, where it links to the E 29, the E 31, the E 35, and the E 40, enabling travel to France, Luxembourg, the Netherlands, Switzerland, Italy, Belgium, and even as far as Poland and Russia.
Its total length is .