Gros Noyer – Saint-Prix (French pronunciation: [ɡʁo nwaje sɛ̃ pʁi]) is a railway station in the commune of Ermont (Val-d'Oise department), France.

The station is served by Transilien H trains from Paris to Persan-Beaumont via Saint-Leu-la-Forêt.

The daily number of passengers was between 2,500 and 7,500 in 2002.

[1] The station has 2 free parking lots with 20 and 150 places.

Le Gros Noyer – Saint-Prix is located on the line from Ermont-Eaubonne to Valmondois, that was opened in 1876.