Vũ Văn Nhậm (武文任, ?–1788) was a general of Tây Sơn dynasty.
Later, Chỉnh was captured and executed, but Nhậm could not find Lê Chiêu Thống.
In order to gain popularity among Northern Vietnamese, Nhậm install Lê Duy Cận as "Prince Regent" (監國 giám quốc), but very few people support them.
Sở and Lân regarded it as treason, and reported Nhậm's actions to Nguyễn Huệ.
Huệ led an army marched north, and launched a night raid.