Paris Métro Line 7

Paris Métro Line 7 is one of sixteen currently open lines of the Paris Métro system, which links La Courneuve–8 mai 1945 in Seine-Saint-Denis northeast of Paris, with Mairie d'Ivry southeast and Villejuif–Louis Aragon in the south, while passing through important parts of central Paris on a northeast to diagonal to south route.

Line 7 began operating in 1910 and, along with Line 13, is one of the only two Métro lines currently into branched operation. Line 3 also was meant to branch at Gambetta, but this was cancelled in favor of a branch becoming line 3bis. Line 7 did originally split north, at Louis Blanc, but a notable difference in usage between the two branches (due to Porte de la Vilette being a large bus hub serving the neighbouring Seine-Saint-Denis department) had the branch heading to Place du Danube separated in 1967 to become Line 7bis. In 1982, a new branch was added in the southeast of Maison Blanche and heading towards Villejuif. Line 7 has only steel rails.

At 18.6 km (12 mi), Line 7 is one of the longest in the Paris Métro network. In addition, it contains the most stations as well as being the fourth most-used line of the Paris Métro, with 135.1 million riders in 2017.