The national flag of Vietnam, formally the National Flag of the Socialist Republic of Vietnam, locally recognized as cờ đỏ sao vàng or cờ Tổ quốc, was designed in 1940 and used during an uprising against the French in southern Vietnam that year. The red background symbolizes revolution and bloodshed. The golden star represents the five main classes in Vietnamese society—intellectuals, farmers, workers, entrepreneurs, and soldiers.

The flag of South Vietnam was first introduced by the Provisional Central Government of Vietnam, later served as the national flag of the State of Vietnam, and its successor, the Republic of Vietnam from 1948 to 1975 until the fall of Saigon. The design consists of a yellow background with three red horizontal stripes through the middle. It is used to represent the "Vietnamese Heritage and Freedom Flag".