Line B (Ligne B) is a line on the Lyon Metro that runs between Charpennes and Gare d'Oullins. It was constructed using the cut-and-cover method, and went into service on May 2, 1978. It, together with Line A, were the inaugural lines of the Lyon Metro. It has since been extended three times: from Part-Dieu to Jean Macé in 1981, from Jean Macé to Stade de Gerland in 2000, and from Stade de Gerland to Oullins railway station in 2013. The line serves 10 stations, and is 7.7 kilometres (4.8 mi) long. Line B trains run on tires rather than steelwheels; it is a rubber-tired metro line.
Line B was extended a few kilometres southbound from Stade de Gerland to Oullins railway station. A tunnel had to be built under the Rhône River. This extension opened on 11 December 2013 at 2pm (11/12/13, 14:00).
In the long term, the line should be automatised and equipped with rolling stock similar to the one of the Line 14 in Paris.