Flag of Tonga

Tonga
UseCivil and state flag, civil and state ensign Small vexillological symbol or pictogram in black and white showing the different uses of the flag Small vexillological symbol or pictogram in black and white showing the different uses of the flag Reverse side is mirror image of obverse side
Proportion1:2
Adopted4 November 1875; 149 years ago (1875-11-04)
DesignA red field with the white rectangle on the upper hoist-side corner bearing the red Greek Cross in the centre.
Naval Ensign of Tonga
UseNaval ensign Small vexillological symbol or pictogram in black and white showing the different uses of the flag Small vexillological symbol or pictogram in black and white showing the different uses of the flag Reverse side is mirror image of obverse side
Proportion1:2
Royal Standard of Tonga
UseRoyal standard
Proportion39:55
Tonga flags flying above a ceremonial gate to celebrate the coronation of Tupou VI

The national flag of Tonga consists of a red field with a white canton charged with a red couped cross. Adopted in 1875 after being officially enshrined into the nation's constitution, it has been the flag of the Kingdom of Tonga since that year. The constitution stipulates that the national flag can never be changed.