The national flag of the Republic of the Congo (French: drapeau de la république du Congo) consists of a yellow diagonal band divided diagonally from the lower hoist-side corner, with a green upper triangle and red lower triangle.

[2] The new flag was officially adopted on 15 September 1959 and remained unchanged when the French Congo became an independent state less than a year later on 15 August 1960.

[5] This featured a red field charged with the country's new coat of arms—a gold star with an overlapping hammer and hoe encircled by a wreath made of two palm branches—in the top-left canton.

[7] The red flag remained in place until 1991, when economic problems and the weakening of the Soviet Union's power due to the Revolutions of 1989 culminated in democratic elections and ultimately, the collapse of the People's Republic of the Congo.

The green symbolizes the agriculture and forests of the Congo, while the yellow represents the "friendship and nobility" of the Congolese people.