Murong Long (Chinese: 慕容隆) (died 397), formally Prince Kang of Gaoyang (高陽康王), was a general and imperial prince of China's Xianbei-led Later Yan dynasty.
He was a son of the founding emperor Murong Chui (Emperor Wucheng) and a brother of Murong Bao (Emperor Huimin), and when his brother's empire was under threat from the rival Northern Wei's prince Tuoba Gui, he tried to save it, but was killed by his nephew Murong Hui, intent on seizing power from both his father and his uncles.
When Murong Chui subsequently resolved to rebel against Former Qin after its emperor Fu Jiān was defeated at the Battle of Fei River in his attempt to conquer Jin and reunite China, Murong Long was involved in his first act of rebellion — massacring the Di soldiers that Murong Chui's deputy, Fu Feilong (苻飛龍), commanded.
He continued to distinguish himself in campaigns against independent warlords and Jin generals.
However, in fall 396, Northern Wei launched a major campaign against Later Yan, and Tuoba Gui, after defeating Murong Nong and seizing Bing Province (并州, modern central and northern Shanxi), then advanced against Zhongshan.