Abstarct: Abstract Dams are man-made structures that require constant monitoring to maintain their performance and safety. Assessing the deformation of dams using traditional methods can be time-consuming and economically costly. Recently, the technique of Interferometric Synthetic Aperture Radar (InSAR) has proved its potential to measure ground and structural deformation. This geodetic method represents a cost-effective way to monitor millimetre-level displacements and can be used as supplemental analysis to detect movements in the structure and its surroundings. The purpose of this work is to evaluate the ability of radar interferometry techniques to investigate the deformation of Karkheh and Sefidroud dams and the displacement of the surrounding lands in the period 2014-2021, using Sentinel-1A images. In this research, 64 ascending and 21 descending mode images, were processed exploiting the Permanent Scatterers (PS) and Small baxseline Subset (SBAS) to investigate the displacement in Karkheh dam, and 24 ascending images were used to assess the displacement of Sefidroud dam using PSI method. Sefidroud dam is a gravity dam that was built in the 1960s. The Karkhe earth dam, which was built in the 70s, is the largest earth dam in the Middle East, designed to irrigate agricultural lands and prevent downstream floods. The Sefidrood dam also is one of the most important dams in the north of Iran, which plays a vital role in providing agricultural water and electricity production in Gilan province. Therefore, dams are considered a structure of high importance, which means that their failure causes social and economic damage to communities, and for this reason, they need continuous monitoring. The results obtained form time series analysis of PS points on the body of the Karkheh dam show that the middle of the dam body has subsided at an approximate rate of 5 to 12 mm/year and eastern and western supports experience uplift with a rate of 1 to 10 mm/year. In addition, land subsidence can be seen in the southwest and northwest of the region. Comparison between ascending and descending results showed a general agreement. Also, the relationship between tectonic activities and the geological condition of the dam site was investigated. In the investigation of Sefidroud dam displacement, the highest amount of uplift in the dam body was observed at 3 mm per year.