The national flag of Luxembourg[a] consists of three horizontal stripes, watermelon red, white and light blue, and can be in 1:2 or 3:5 ratio.

Ten white and blue stripes serve as the field for a red lion with a yellow tongue, claws and crown, and a doubled tail (à la queue fourchée).

On 5 October 2006, MP Michel Wolter introduced a legislative proposition[4] to replace the current red-white-blue national flag with the red lion ensign.

He argued that the current flag was commonly confused with that of the Netherlands and that the red lion on the other hand was more popular, more aesthetic and of greater historic value.

During sporting events like the Tour de France supporters for Luxembourg participants now overwhelmingly use the Ensign instead of the Flag.

In end of July 2015, a Luxembourger Marc Dax submitted a formal petition to the Chamber of Deputies to replace the current national flag with the Roude Léiw.

For historical reasons, the adjacent Belgian province of Luxembourg uses a flag that also features a lion superimposed on horizontal stripes.