Rugby Club Massy Essonne is a French rugby union club from Massy, Essonne that play in the Pro D2, the second tier of the French league system.
They are based in Massy, Essonne, in the southern suburbs of Paris and were founded in 1971. They were promoted from the Federale 1 at the end of the 2011–12 season, entering professional rugby for the first time in their history.
Their stay in Pro D2 was short-lived: they were demoted at the end of the 2012–13 Rugby Pro D2 season. On 24 May 2014, it was announced that they had won promotion back to Pro D2 for the 2014–15 season as a result of winning the Fédérale 1 semi-final 17 – 9 against Tyrosse.
Note: Flags indicate national union as has been defined under IRB eligibility rules. Players may hold more than one non-IRB nationality.