Gare de Saint-Nom-la-Bretèche – Forêt de Marly is a railway station in the French commune of L'Étang-la-Ville in the département of Yvelines. Its name derives from Saint-Nom-la-Bretèche and the Forêt de Marly. It links to the CSO bus lines 42, 43 and 44.
It is one of the termini of the Transilien Paris-Saint-Lazare, made up of one platform between two lines.
It is served by the Grande ceinture Ouest (GCO) line, towards Noisy-le-Roi and Saint-Germain-en-Laye Grande-Ceinture.
A new switch has been built along the platforms of this line, handling general information on the line, and from here transmitting train information in real time to five stations and travellers.
Coordinates: 48°52′04″N 2°03′04″E / 48.86778°N 2.05111°E