Emperor Mun of Balhae (r. 737–793), also known as Dae Heum-mu, was the third and longest-reigning ruler of the Balhae, the successor state to Goguryeo. He succeeded his father King Mu, upon his death in 737.
During Emperor Mun's reign, diplomatic ties with Tang Dynasty China were established, and many Balhae scholars went to China to study, extending the influence of Buddhism and Confucianism in Balhae's governance. He also strengthened relations with Silla, which unified the Korean peninsula to the south of Balhae, overseeing the development of the trade route called Silla-road (Hangul: 신라도, Hanja: 新羅道). Balhae also increased diplomacy and trade with Japan.
Emperor Mun moved the capital of Balhae several times (Sanggyeong and Donggyeong), stabilizing and strengthening central rule over various ethnic tribes in his realm, which was expanded temporarily. He also authorized the creation of the Jujagam (Hangul: 주자감, Hanja: 胄子監), the national academy, based on the national academy of Tang.