The flag of Saint Pierre and Miquelon has an aspect ratio of 2:3. It is divided into three vertical stripes of equal width. The left stripe is blue (#002395), the middle stripe is white (#FFFFFF), and the right stripe is red (#ED2939). In the upper hoist corner, there is a square with a yellow (#FCD116) border that occupies half of the flag's width and height. Inside the square, there are three smaller squares arranged in a diagonal line from the top-left to the bottom-right. The top square is blue (#002395) with a white (#FFFFFF) sailing ship, the middle square is white (#FFFFFF) with three yellow (#FCD116) fleurs-de-lis, and the bottom square is red (#ED2939) with two yellow (#FCD116) lions.