The fall of Saigon was the capture of Saigon, the capital of South Vietnam, by North Vietnam on 30 April 1975. The event marked the end of the Vietnam War and the collapse of the South Vietnamese state, leading to a transition period and the formal reunification of Vietnam into the Socialist Republic of Vietnam under communist rule on 2 July 1976.

Ho Chi Minh City, commonly known as Saigon, is the most populous city in Vietnam, with a population of around 9.3 million in 2023. The city's geography is defined by rivers and canals, of which the eponymously-named Saigon River is the largest. As a municipality, Ho Chi Minh City consists of 16 urban districts, five rural districts, and one municipal city (sub-city). As the largest financial centre in Vietnam, Ho Chi Minh City has the highest gross regional domestic product out of all Vietnam provinces and municipalities, contributing around a quarter of the country's total GDP. Ho Chi Minh City's metropolitan area is ASEAN's 6th largest economy, also the biggest outside an ASEAN country capital.