Flag of Tonga

Tonga's national flag features a red field with a white rectangle in the upper hoist-side corner. Centered within the white rectangle is a red Greek cross. The flag's aspect ratio is 1:2.

The red color of the field and cross symbolizes the blood of Christ, representing the Christian faith prevalent in Tonga. White denotes purity, signifying the values of the nation. The cross, a central emblem, underscores Tonga's deep Christian beliefs and the importance of faith in its national identity.

It was officially adopted in 1875, formally enshrined in the constitution of Tonga. King George Tupou I designed the original flag. Unusually, the constitution specifies that the flag can never be changed, providing stability and continuity.