The Early Upper Palaeolithic was for a long time an under-evidenced period in the North of France. In recent years, however, new discoveries have been on the increase thanks to large scale preventive archaeological operations, the most important of which is related to the “Canal Seine-Nord Europe” project. In this context, a small lithic set of 59 pieces ascribable to the Gravettian was found in the deep exploration trench N°31, at Catigny (Oise). The artefacts were found in secondary position, caught in a shallow gully filled up with sandy deposits. A tundra Gley subsequent to the filling of this gully can be dated to 26 ka. The lithic artefacts consist of a dozen large blades and two tools. They were produced using a soft organic striker, following a one-direction process. No diagnostic features (such as tools or armatures) were found, but the technological characteristics are close to those of the Amiens-Renancourt 1 lithic production, fifty kilometers away to the North-West. Thus, the Catigny industry can probably be assigned to the facies of the Late Gravettian. Even if the context is not ideal, the discovery of this new Early Upper Palaeolithic site fits in with the new thinking about how the area was populated and the representativeness of this period in a region with a periglacial climate at the end of the Weichselian. Traduction : Margaret & Jean-louis CADOUX