甘达基河（英语：Gandaki River；尼泊尔语：कालीगण्डकी नदी，印地语：गंडक नदी），又译根德格河，是南亚的河流，流经尼泊尔和印度，最终在巴特那附近注入恒河，河道全长630公里，流域面积46,300平方公里，河畔城镇有婆罗多布尔。

甘达基河在尼泊尔境内称为「那拉雅尼河」，也称为「沙普塔甘达基河」（Sapta Gandaki，意指七条甘达基河），因为它在尼泊尔中部的喜马拉雅山区有七条主要支流：卡里甘达基河、特里苏里河，以及特里苏里河的五条支流，包括塞蒂河、马蒂河、马沙阳蒂河、达劳蒂河及布利河。

The Gandaki River (also known as the Narayani in southern Nepal and the Gandak in India) is one of the major rivers of Nepal and a left bank tributary of the Ganges in India. In Nepal the river is notable for its deep gorge through the Himalayas and its enormous hydroelectric potential. It has a total catchment area of 46,300 square kilometers (17,900 sq mi), most of it in Nepal. The basin also contains three of the world's 14 mountains over 8,000 metres (26,000 ft), Dhaulagiri, Manaslu and Annapurna I. Dhaulagiri is the highest point of the Gandaki basin. It lies between the similar Kosi system to the east and the Karnali (Ghaghara) system to the west.