加格拉河（英语：Ghaghara；印地语：घाघरा，Ghāghrā [ˈɡʱɑːɡrɑː]），又名格尔纳利河（英语：Karnali，尼泊尔语：कर्णाली，Karṇālī [kʌrˈnɑːliː]），是南亚的河流，属于恒河的左支流，发源自**喜马拉雅山脉南坡，流经尼泊尔和印度，河道全长1,080公里，流域面积127,950平方公里，河畔城镇有法扎巴德。

格尔纳利河干流上游河段位于中国**阿里地区普兰县境内，称为马甲藏布，又名孔雀河。

Ghaghara, also called Karnali (Nepali:कर्णाली Karṇālī [kʌrˈnɑːliː]; Hindi: घाघरा Ghāghrā [ˈɡʱɑːɡrɑː]; Chinese: 加格拉河) is a perennial trans-boundary river originating on the *****an Plateau near Lake Mansarovar. It cuts through the Himalayas in Nepal and joins the Sharda River at Brahmaghat in India. Together they form the Ghaghra River, a major left bank tributary of the Ganges. With a length of 507 kilometres (315 mi) it is the longest river in Nepal. The total length of Ghaghara River up to its confluence with the Ganges at Doriganj in Bihar is 1,080 kilometres (670 mi). It is the largest tributary of the Ganges by volume and the second longest tributary of the Ganges by length after Yamuna.