Landslide is a serious problem in the mountainous region of western and northern parts of Iran. It cases enormous economic damages and losses life annually. This paper presented the landslide hazard and the major factors influencing on the movement of landslide in Iran. Many of landslides are reactivated and have been triggered by human activity although always related to period of continued rainfall or other accelerated phenomena suach as earthquake. Construction of building, slope cutting, road building, and deforestatuion are causes of failure hazards. Geological, Geotechnical, geomorphological, weathering, and hydrogeological conditions are the critical among the national factors.

Keywords