Paris Métro Line 11 (French: Ligne 11 du métro de Paris) is one of the sixteen currently open lines of the Paris Métro. It links Châtelet to Rosny–Bois-Perrier in Rosny-sous-Bois, in the neighboring department of Seine-Saint-Denis. Opened in 1935, line 11 was one of the last historical lines to be put into service, even after the first parts of lines 12 and 13. It was then intended to replace the Belleville funicular tramway, which closed in 1924. The line is 11.7 km (7.3 mi) in length with 19 stations.
Before its 2024 extension east from Mairie des Lilas, it was one of the least used lines, with less than forty million passengers in 2023, and also ran the oldest trains still in service, the MP 59. The RATP expects thirty-one million more in 2025 after the eastbound expansion.