Massy–Palaiseau (French pronunciation: [masi palɛzo]) is a train station in the city of Massy. It is a junction of the RER B, RER C, Transilien Line V and tramway Line 12. In the future, Paris Métro Line 18 of Grand Paris Express will stop here. It is a station in this southern outer suburb of Paris, with a connection to the Massy TGV station.