Orbais-l'Abbaye (French pronunciation: [ɔʁbɛ labei], before 1988: Orbais)[3] is a commune in the Marne department in north-eastern France.

The abbey at Orbais was founded at the end of the 7th century by Saint Réol, and the remains (including a church) are situated in the centre of the town.

Founded at the end of the 7th century by Saint Réol, 26th Bishop of Reims, the benedictine Abbey is located in the Surmelin valley.

[4] During World War I, the French 5th Army established its campaign headquarters in the castle on 3 September 1914.

The architecture is superb, particularly the façade, with its two towers similar to those of the Basilica Saint-Rémi de Reims and the choir with ambulatory with five radiating chapels.