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.
Since extension of Line 14 to Saint-Lazare in 2004, it is connected to Saint-Lazare metro station (which is near Saint-Lazare railway station) by a long underground passageway. This allows interchange to Line 14 as advertised on RATP maps. In fact, there is also connection to the lines 3, 12 and 13 but under normal operating conditions these connections are not useful and are not indicated on RATP maps.