Flag of Belgium

Kingdom of Belgium
Use	National flag
Proportion	13:15
Adopted	23 January 1831
Design	A vertical tricolour of black, yellow, and red.
Use	Civil ensign
Proportion	2:3 or similar
Design	A vertical tricolour of black, yellow, and red.
Use	State ensign
Proportion	2:3
Adopted	1950
Design	As above, with the central pale defaced by a lion rampant ensigned by a crown, both sable (black), the lion armed and langued gules (red).
Use	Naval ensign
Proportion	2:3
Adopted	23 February 1950
Design	A yellow saltire on a white field, bordered above and below in red and to the left and right in black, charged on the top with a crown above crossed cannons and on the bottom by a fouled anchor.

The national flag of Belgium (Dutch: vlag van België, French: drapeau de la Belgique, German: Flagge Belgiens) is a tricolour consisting of three equal vertical bands displaying the national colours of Belgium: black, yellow, and red. The colours were taken from the coat of arms of the Duchy of Brabant, and the vertical design may be based on the flag of France. When flown, the black band is nearest the pole (at the hoist side). It has the unusual proportions of 13∶15.

In 1830, the flag, at that time non-officially, consisted of three horizontal bands, with the colors red, yellow and black. On 23 January 1831, the National Congress enshrined the tricolor in the Constitution, but did not determine the direction and order of the color bands. As a result, the "official" flag was given vertical stripes with the colors black, yellow and red.