The Fall of Saigon (in Vietnamese: Sự kiện 30 tháng 4 - April 30 Incident; Giải phóng miền Nam - The Liberation of the South by supporters of the Democratic Republic of Vietnam; Ngày mất nước - The Day of losing the nation by supporters of the former Republic of Vietnam) was the capture of Saigon, the capital of the Republic of Vietnam (South Vietnam) by the People's Army of Vietnam (PAVN), the armed forces of the Democratic Republic of Vietnam (North Vietnam), on 30 April 1975. The event marked the end of the Vietnam War and the start of a transition period leading to the formal reunification of Vietnam under Communist rule.

PAVN forces under the command of the Senior General Van Tien Dung began their final attack on Saigon, which was commanded by General Nguyen Van Toan on 29 April, with a heavy artillery bombardment. By the afternoon of the 30th, North Vietnamese troops had occupied the important points within the city and raised their flag over the Independence Palace. South Vietnam capitulated shortly after. The city was renamed Ho Chi Minh City.

The fall of the city was preceded by the evacuation of almost all the American civilian and military personnel in Saigon, along with tens of thousands of South Vietnamese civilians. The evacuation culminated in Operation Frequent Wind, which was the largest helicopter evacuation in history.^[2] In addition to the flight of refugees, the end of the war, and institution of new rules by the Communists contributed to a decline in the population of the city.