The flag of the Republic of the Congo features a diagonal tricolor design with three colors: green, red, and yellow. The aspect ratio is 2:3.

The flag is divided into two triangles by a diagonal line running from the lower hoist-side corner to the upper fly-side corner. The left triangle (hoist side) is green, while the right triangle (fly side) is yellow. A red band runs diagonally between the green and yellow triangles.

Color codes:

• Green: Pantone 347 C, HEX #009543
• Red: Pantone 186 C, HEX #E1001B
• Yellow: Pantone 116 C, HEX #FFCD00

The width of the red band is one-third of the flag's height.