Abstract: This study aims to establish a geological heritage (geosite) inventory for Adıyaman Province and to evaluate the geotourism potential of this heritage. Within the scope of the study, geosites through out the province were systematically cataloged based on the ProGEO (1998) and Kazancı et al. (2015) classifications, their geographical distribution was mapped, and they were categorised according to their scientific, educational, and visual/aestheticvalues. Adıyaman is located on complex tectonic structures of the Bitlis-Zagros Orogeny, formed by the collision ofthe African, Arabian, and Eurasian plates. This geological history has led to the emergence of numerous geological heritage features with national and international importance. The findings reveal that despite its geographically small area, Adıyaman possesses extraordinary geodiversity. This rich accumulation of geological and natural assets indicates that the region holds significant, yet untapped, geotourism potential. In particular, integrating the identified geological heritage with the archaeological wealth of Mount Nemrut offers a strategic opportunity for sustainable regional development. However, anthropogenic threats such as quarrying, vandalism, and legal gaps endangerthis heritage. The study proposes comprehensive geo conservation and geotourism strategies against these threats, including site protection, buffer zone establishment, local employment, development of thematic georoutes, and the  establishment of a UNESCO global geopark. In conclusion, interdisciplinary cooperation, scientific research, andenhancing public awareness are crucial for the sustainable conservation of Adıyaman`s geological heritage and its transformation in to regional development through geotourism.