Ground deformation monitoring at a local scale requires a high accuracy and a dense time/space resolution. In practice, the cost of the existing techniques can be a limiting factor for such resolution and density of measurement. Radio-Frequency Identification (RFID) technology appears as an alternative to monitor displacements on a landslide. The low-cost passive RFID tags (20€ / tag) allows for a very dense resolution, in both space and time, at the scale of a 100-m-large surface. This study propose to use such tags on a landslide, to validate its ability to monitor the surface deformation of a landslide outdoors, and assess its accuracy. With this aim, 19 passive RFID tags were deployed on a landslide for 5 months. The relative displacement was estimated by measuring the phase difference of arrival, and compared to a laser tacheometer and an extensometer. That technique reacheed an accuracy of 1 cm during normal weather and 4 cm during snow events, for a range up to 60 m. It could potentially monitor the displacements of other objects, such as volcanoes, buildings, unstable rocks, or snow surface.