U8 is a line on the Berlin U-Bahn. It has 24 stations and is 18.1 km (11.2 mi) long. The U8 is one of three north–south Berlin U-Bahn lines, and runs from Wittenau to Neukölln via Gesundbrunnen. The original proposal was for a suspended monorail like the Wuppertal Schwebebahn.

The Berlin U-Bahn is a rapid transit system in Berlin, the capital and largest city of Germany, and a major part of the city's public transport system. Together with the S-Bahn, a network of suburban train lines, and a tram network that operates mostly in the eastern parts of the city, it serves as the main means of transport in the capital.