Sainte-Marie-la-Robert (French pronunciation: [sɛ̃t maʁi la ʁɔbɛʁ] ⓘ) is a commune in the Orne department in north-western France.

[4] The commune is within the Normandie-Maine Regional Natural Park.

[5] Sainte-Marie-la-Robert along with another 69 communes is part of a 20,593 hectare, Natura 2000 conservation area, called the Haute vallée de l'Orne et affluents.

The highest point in the commune is 207 metres (679 ft).

The river Udon along with two streams, the Coupigny and the Moulin de Besnard are the three watercourses that traverse the commune.