Long tinh flag
| Use | Imperial standard; National flag |
|---|---|
| Proportion | 2:3 |
| Adopted | c. 1941 (national flag) |
Long Tinh Flag (Vietnamese: Long tinh kỳ, Chinese characters: 龍星旗), also known as the Long Bội Tinh Flag, was a flag with a yellow field and a vertical red stripe at the center, designed based on the ribbon of the Đại Nam Long tinh. The flag was originally used as a ceremonial flag to welcome the emperor, and was later adopted as the national flag of Đại Nam in the early 1940s.