Jang Mun-hyu (Korean: 장문휴; Hanja: 張文休) was a military commander of Balhae Korea in the 8th century under the reign of King Mu.
King Mu son of Dae jo yeong of Balhae was known for the audacity that he demonstrated against Tang.
To prevent further contacts between Tang and its allies, Heuksu Malgal tribes, King Mu ordered his commander Jang Mun-hyu to attack Dengzhou in Shandong Peninsula.
As a result of the a naval assault launched by him in 732, the city's Chinese prefect, Wei Jun (偉俊) was killed.
[1] Dengzhou was occupied for short time by his forces, before his tactical retreat from the city.