The Hue–Da Nang Campaign was a series of military actions conducted by the People's Army of Vietnam (PAVN) against the Army of the Republic of Vietnam (ARVN) during the Vietnam War, also known in Vietnam as the American War. The campaign was centred on the cities of Huế (Thừa Thiên-Huế Province) and Da Nang (Quảng Nam Province), with secondary fronts in the provinces of Quảng Trị and Quảng Ngãi. The campaign began on March 5 and concluded on April 2, 1975.
During the spring season of 1975, the PAVN High Command in Hanoi made the decision to seize the major South Vietnamese cities of Huế and Da Nang, and also destroy the various South Vietnamese units in I Corps Tactical Zone, led by ARVN General Ngô Quang Trưởng. Originally, the campaign was planned to take place over two phases; during the seasons of spring-summer and autumn. However, as the North Vietnamese forces rolled over South Vietnamese defences on the outskirts of Huế and Da Nang, President Nguyễn Văn Thiệu ordered General Trưởng to abandon all territories under his control, and pull his forces back to the coastal areas of I Corps. The South Vietnamese withdrawal quickly turned into a rout, as the PAVN 2nd Army Corps picked off one South Vietnamese unit after another, until Huế and Da Nang were completely surrounded. By March 29, 1975, PAVN troops had full control of Huế and Da Nang, while South Vietnam lost all territories and most of the units belonging to I Corps.
On March 31, ARVN General Phạm Văn Phú—commander of II Corps Tactical Zone—attempted to form a new defensive line from Qui Nhơn to cover the retreat of the ARVN 22nd Infantry Division, but they too were destroyed by the PAVN. By April 2, South Vietnam had lost control of the northern provinces, as well as two army corps.

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