Saint-Michel–Notre-Dame is a station on line B and line C of the Réseau Express Régional (RER) in Paris. Located in the 5th arrondissement, the station is named after the nearby Saint-Michel area and Notre-Dame Cathedral. The station opened, as Pont Saint-Michel and with platforms on the line that is now RER line C, in 1900. It gained its current name in 1988 with the opening of the line B platforms.

RER B is one of the five lines in the Réseau Express Régional, a hybrid commuter rail and rapid transit system serving Paris, France and its Île-de-France suburbs. The 80-kilometre (50 mi) RER B line crosses the region from north to south, with all trains serving a group of stations in central Paris, before branching out towards the ends of the line.