Flag of Belgium

Belgium
UseNational flag
Proportion13:15
AdoptedJanuary 23, 1831
DesignA vertical tricolour of black, yellow, and red. Technically the national flag, but rarely seen.
Variant flag of Belgium
UseNational flag and civil ensign
Proportion2:3 or similar
DesignAs above. Much more common than the official version.
Variant flag of Belgium
UseState ensign
Proportion2:3

The national flag of Belgium has three equal vertical bands of black, yellow, and red. The colours were taken from the colours of the Duchy of Brabant.