| Country | Flag description |
| Kenya | three equal horizontal bands of black (top), red, and green; the red band is edged in white; a large warrior's shield covering crossed spears is superimposed at the center |
| Kiribati | the upper half is red with a yellow frigate bird flying over a yellow rising sun, and the lower half is blue with three horizontal wavy white stripes to represent the ocean |
| Korea, North | three horizontal bands of blue (top), red (triple width), and blue; the red band is edged in white; on the hoist side of the red band is a white disk with a red five-pointed star |
| Korea, South | white with a red (top) and blue yin-yang symbol in the center; there is a different black trigram from the ancient I Ching (Book of Changes) in each corner of the white field |
| Kosovo | centered on a dark blue field is the geographical shape of Kosovo in a gold color surmounted by six white, five-pointed stars - each representing one of the major ethnic groups of Kosovo - arrayed in a slight arc |
| Kuwait | three equal horizontal bands of green (top), white, and red with a black trapezoid based on the hoist side; design, which dates to 1961, based on the Arab revolt flag of World War I |
| Kyrgyzstan | red field with a yellow sun in the center having 40 rays representing the 40 Kyrgyz tribes; on the obverse side the rays run counterclockwise, on the reverse, clockwise; in the center of the sun is a red ring crossed by two sets of three lines, a stylized representation of the roof of the traditional Kyrgyz yurt |
| Laos | three horizontal bands of red (top), blue (double width), and red with a large white disk centered in the blue band |
| Latvia | three horizontal bands of maroon (top), white (half-width), and maroon |
| Lebanon | three horizontal bands consisting of red (top), white (middle, double width), and red (bottom) with a green cedar tree centered in the white band |
| Lesotho | three horizontal stripes of blue (top), white, and green in the proportions of 3:4:3; the colors represent rain, peace, and prosperity respectively; centered in the white stripe is a black Basotho hat representing the indigenous people; the flag was unfurled in October 2006 to celebrate 40 years of independence |
| Liberia | 11 equal horizontal stripes of red (top and bottom) alternating with white; there is a white five-pointed star on a blue square in the upper hoist-side corner; the design was based on the US flag |
| Libya | plain green; green is the traditional color of Islam (the state religion) |
| Liechtenstein | two equal horizontal bands of blue (top) and red with a gold crown on the hoist side of the blue band |
| Lithuania | three equal horizontal bands of yellow (top), green, and red |
| Luxembourg | three equal horizontal bands of red (top), white, and light blue; similar to the flag of the Netherlands, which uses a darker blue and is shorter; design was based on the flag of France |
| Macau | light green with a lotus flower above a stylized bridge and water in white, beneath an arc of five gold, five-pointed stars: one large in center of arc and four smaller |
| Macedonia | a yellow sun with eight broadening rays extending to the edges of the red field |
| Madagascar | two equal horizontal bands of red (top) and green with a vertical white band of the same width on hoist side |
| Malawi | three equal horizontal bands of black (top), red, and green with a radiant, rising, red sun centered in the black band |
| Malaysia | 14 equal horizontal stripes of red (top) alternating with white (bottom); there is a blue rectangle in the upper hoist-side corner bearing a yellow crescent and a yellow 14-pointed star; the crescent and the star are traditional symbols of Islam; the design was based on the flag of the US |
| Maldives | red with a large green rectangle in the center bearing a vertical white crescent; the closed side of the crescent is on the hoist side of the flag |
| Mali | three equal vertical bands of green (hoist side), yellow, and red; uses the popular pan-African colors of Ethiopia |
| Malta | two equal vertical bands of white (hoist side) and red; in the upper hoist-side corner is a representation of the George Cross, edged in red |
| Marshall Islands | blue with two stripes radiating from the lower hoist-side corner - orange (top) and white; there is a white star with four large rays and 20 small rays on the hoist side above the two stripes |
| Mauritania | green with a yellow five-pointed star above a yellow, horizontal crescent; the closed side of the crescent is down; the crescent, star, and color green are traditional symbols of Islam |
| Mauritius | four equal horizontal bands of red (top), blue, yellow, and green |