The flag of South Vietnam was first introduced on 2 June 1948 as the official symbol of the French-associated Provisional Central Government of Vietnam, later served as the national flag of the State of Vietnam and the Republic of Vietnam (commonly known as South Vietnam) from 1949 to 30 April 1975. The design consists of a yellow background with three red horizontal stripes through the middle, representing northern, central, and southern Vietnam.
Although the Republic of Vietnam ceased to exist in 1975, the flag is still represented among private citizens in other countries by the Vietnamese diaspora, particularly in American, Canadian, and Australian communities of refugee-descent as a major anti-communist symbol. Since June 2002, several American governmental bodies adopted resolutions recognizing the former flag as the Vietnamese Heritage and Freedom Flag.
During the reign of Emperor Gia Long (1802âÂÂ1820), the yellow flag was also used as the symbol of the Empire of Vietnam. This was continued as the emperor's flag when the court of Huế became a French protectorate. Later the flag added a red bend on two sides.
After the deportation and exile of the emperors Thành Thái and Duy Tân by the French colonialists, the new pro-French emperor Khải ÃÂá»Ânh introduced new imperial flag as a yellow flag with single horizontal band of red, following the Imperial Order of the Dragon of Annam. Formally known as the Long tinh flag, it was the official flag of the Nguyá» n court.
In 1945 with the French ousted by Japan, Prime Minister Trần Trá»Âng Kim of the newly restored Empire of Vietnam adopted another variant of the yellow flag. It included three red bands, but the middle band was broken to form the . Derived from the trigrams, Quẻ Ly is the third of the Bát Quái (the Eight Trigrams â Ba gua): Càn (ä¹¾), ÃÂoài (å Â), Ly (é¢), Chấn (éÂÂ), Tá»Ân (å·½), Khảm (Ã¥ÂÂ), Cấn (è®), Khôn (å¤). It was chosen to symbolize the sun, fire, light, and civilization. And most importantly, it represents the southern lands under the "Later Heaven" order, that is Vietnam. This flag was used briefly from June to August 1945 when Emperor Bảo ÃÂại abdicated.
On 2 June 1948, the prime minister of the Provisional Central Government of Vietnam, Brigadier General Nguyá» n VÃÂn Xuân, signed the decree with the specifications for the Vietnamese national flag as follows: "The national emblem is a flag of yellow background, the height of which is equal to two-thirds of its width. In the middle of the flag and along its entire width, there are three horizontal red bands. Each band has a height equal to one-fifteenth of the width. These three red bands are separated from one another by a space of the band's height." Another decree on June 14 reaffirmed the same flag design.
The new national flag was raised for the first time on 5 June 1948 on a boat named Dumont d'Urville outside of Hạ Long Bay during the signing of the Halong Bay Agreements (Accords de la baie dâÂÂAlong) by High Commissioner Emile Bollaert and Nguyá» n VÃÂn Xuân.
A detailed design of the flag appeared on the newspaper on 3 June 1948, and again on the next day (with correction to the flag ratio). The residents of Hanoi were requested to display the flag at their home on 5 June 1948 to celebrate the Hạ Long Bay event. The flag's design drew on earlier Vietnamese flags and has been attributed to several people, including Lê VÃÂn ÃÂá»Â, Tôn Thất Sa, and the group of Trần VÃÂn ÃÂôn and Lê VÃÂn Kim. When the former emperor Bảo ÃÂại was made chief of state in 1949, this design was adopted as the flag of the State of Vietnam.
The three red bands have the divination sign of Quẻ Càn, the first of the Eight Trigrams mentioned above. Quẻ Càn represents heaven. Based on the traditional worldview of the Vietnamese people, Quẻ Càn also denotes the South (as of the "Earlier Heaven" order), the Vietnamese Nation, Vietnamese people, and the people's power. Another interpretation places the three red bands as symbols of the three regions of Vietnam: North, Central, and South.
With the foundation of the republic in 1955, the flag was adopted by the successor state, the Republic of Vietnam (more commonly known as South Vietnam). It was the national flag for the entire duration of that state's existence (1955âÂÂ1975) from the First Republic to the Second Republic. With the capitulation of Saigon on 30 April 1975, the Republic of Vietnam came to an end and the flag ceased to exist as a state symbol. Afterwards, it has been adopted by many in the Vietnamese diaspora to symbolically distance themselves from the Communist government and continues to be used either as an alternative symbol for national unity or as a protest tool against the current government.
Although Vietnam's current law does not explicitly prohibit the display of the South Vietnamese flag, its use is de facto criminalized under the provision of "Making, storing, spreading information, materials, items for the purpose of opposing the State of Socialist Republic of Vietnam", along with other anti-government offenses, effectively restricting its display beyond limited educational contexts. Since the flag is associated with the large anti-communist Vietnamese communities worldwide, the government of Vietnam views it as a symbol of treason and defiance against the government. Some people in Vietnam also use "Cali" (sometimes spelled "Kali") as a pejorative for political opponents, which derives from the U.S. state of California, where the largest group of anti-communist Vietnamese people live.
The flag of the former South Vietnam is popular with the case of Vietnamese Americans, Vietnamese Australians, and other Vietnamese around the world who fled Vietnam after the war, who call it the "Vietnamese Heritage and Freedom Flag", and they started the movement to struggle for recognitions for their political identity.
In the United States, Canada, France, Germany, Netherlands, Norway, the United Kingdom, Australia, and New Zealand, few Vietnamese immigrants of that time period use the current flag of Vietnam, which many of them consider offensive. Instead, they prefer to use the flag of South Vietnam in its place to represent them.
A 2 June 1948 ordinance defined the construction of the flag in the following way: The national emblem is a flag of yellow background, the height of which is equal to two-thirds of its width. In the middle of the flag and along its entire width, there are three horizontal red bands. Each band has a height equal to one-fifteenth of the width. These three red bands are separated from one another by a space of the band's height. Hence it is blazoned as Or, three bars Gules.
Unicode includes an emoji flag sequence for the flag of Vietnam but not the flag of South Vietnam. Sequences depicting national flags are based on ISO 3166-1 alpha-2 codes; the Socialist Republic of Vietnam took over South Vietnam's <code>VN</code> code in 1977. In 2017, a Change.org petition asked Apple Inc. and the Unicode Consortium to add a South Vietnamese flag emoji. By 2023, it had collected more than 17,000 signatures. In 2025, the San Jose City Council (home to one of the largest Vietnamese American communities) unanimously passed a resolution calling on the Unicode Consortium, based in nearby Mountain View, California, to include the "Vietnamese Heritage and Freedom Flag" in the Unicode character repertoire.