Paris Métro Line 15

Paris Métro Line 15 is one of four new lines of Grand Paris Express, a major expansion project of the Paris Métro. Currently under construction, the line will provide a new orbital route through the suburbs of Paris, servicing the departments of Hauts-de-Seine, Val-de-Marne and Seine-Saint-Denis. The southern section of the line is planned to open in late 2026, with the completed line planned to open in 2031.

In line with all Grand Paris Express lines, Line 15 will be fully automated. Upon completion, Line 15 will be the world's longest underground rapid transit tunnel dedicated to passenger service.

The line is being built by Société du Grand Paris, a public agency set up by the French Government to deliver the Grand Paris Express project.