Saint-Augustin is a station that serves Line 9 of the Paris Métro, named after the Place Saint-Augustin and the Saint-Augustin church. The station opened on 27 May 1923 with the extension of the line from Trocadéro. After the extension of Line 14 to Saint-Lazare opened in 2004, the station is connected to Saint-Lazare metro station by a long underground passageway. This allows interchange to Line 14 as advertised on RATP maps.