Lan Yu (died 1393) was a Chinese military general and official who contributed to the founding of the Ming dynasty.
For his efforts, in 1379, Lan Yu was conferred the title of "Marquis of Yongchang" (永昌侯), in addition to receiving 2500 dan (石) of grain and a shiquan (世券), a type of plaque granted by the emperor to officials in recognition of their contributions.
In 1381, Lan Yu was appointed "Left Deputy General Who Conquers the South" (征南左副將軍) and accompanied Fu Youde to attack Yunnan and pacify the region.
In 1387, Nahachu (納哈出) of the Northern Yuan invaded Liaodong and the Hongwu Emperor sent Feng Sheng, with Lan Yu and Fu Youde as his right and left deputies respectively, along with a 200,000-man army to attack him.
[3] In 1388, the Hongwu Emperor commissioned Lan Yu as General-in-Chief (大將軍) and sent him with 150,000 troops to attack the Northern Yuan ruler Uskhal Khan.
In the fourth lunar month of that year, Lan Yu's force arrived at Buir Lake and defeated the Northern Yuan army, capturing Uskhal Khan's family members numbering more than 100, more than 77,000 civilians, more than 150,000 livestock, along with several priced items, including Uskhal Khan's imperial seals.
[3] In 1392 a surrendered Yuan general Yuelutiemu'er (月魯帖木兒) rebelled in Jianchang (present-day Xichang, Liangshan Yi Autonomous Prefecture, Sichuan) and Lan Yu was sent to suppress the revolt.
Lan Yu crushed the uprising and captured Yuelutiemu'er and his son, and was appointed as the Crown Prince's Tutor (太子太傅) for his achievement.