| Country | Flag description |
| Mayotte | unofficial, local flag with the coat of arms of Mayotte centered on a white field, above which the name of the island appears in red capital letters; the main elements of the coat of arms, flanked on either side by a seahorse, appear above a scroll with the motto RA HACHIRI (We are Vigilant); the only official flag is the national flag of France |
| Mexico | three equal vertical bands of green (hoist side), white, and red; the coat of arms (an eagle with a snake in its beak perched on a cactus) is centered in the white band |
| Micronesia, Federated States of | light blue with four white five-pointed stars centered; the stars are arranged in a diamond pattern |
| Moldova | three equal vertical bands of blue (hoist side), yellow, and red; emblem in center of flag is of a Roman eagle of gold outlined in black with a red beak and talons carrying a yellow cross in its beak and a green olive branch in its right talons and a yellow scepter in its left talons; on its breast is a shield divided horizontally red over blue with a stylized ox head, star, rose, and crescent all in black-outlined yellow; same color scheme as Romania |
| Monaco | two equal horizontal bands of red (top) and white; similar to the flag of Indonesia which is longer and the flag of Poland which is white (top) and red |
| Mongolia | three equal, vertical bands of red (hoist side), blue, and red; centered on the hoist-side red band in yellow is the national emblem ("soyombo" - a columnar arrangement of abstract and geometric representation for fire, sun, moon, earth, water, and the yin-yang symbol) |
| Montenegro | a red field bordered by a narrow golden-yellow stripe with the Montenegrin coat of arms centered |
| Montserrat | blue, with the flag of the UK in the upper hoist-side quadrant and the Montserratian coat of arms centered in the outer half of the flag; the coat of arms features a woman standing beside a yellow harp with her arm around a black cross |
| Morocco | red with a green pentacle (five-pointed, linear star) known as Sulayman's (Solomon's) seal in the center of the flag; red and green are traditional colors in Arab flags, although the use of red is more commonly associated with the Arab states of the Persian gulf; design dates to 1912 |
| Mozambique | three equal horizontal bands of green (top), black, and yellow with a red isosceles triangle based on the hoist side; the black band is edged in white; centered in the triangle is a yellow five-pointed star bearing a crossed rifle and hoe in black superimposed on an open white book |
| Namibia | a wide red stripe edged by narrow white stripes divides the flag diagonally from lower hoist corner to upper fly corner; the upper hoist-side triangle is blue and charged with a yellow, 12-rayed sunburst; the lower fly-side triangle is green |
| Nauru | blue with a narrow, horizontal, yellow stripe across the center and a large white 12-pointed star below the stripe on the hoist side; the star indicates the country's location in relation to the Equator (the yellow stripe) and the 12 points symbolize the 12 original tribes of Nauru |
| Navassa Island | the flag of the US is used |
| Nepal | red with a blue border around the unique shape of two overlapping right triangles; the smaller, upper triangle bears a white stylized moon and the larger, lower triangle bears a white 12-pointed sun |
| Netherlands | three equal horizontal bands of red (top), white, and blue; similar to the flag of Luxembourg, which uses a lighter blue and is longer; one of the oldest flags in constant use, originating with William I, Prince of Orange, in the latter half of the 16th century |
| Netherlands Antilles | white, with a horizontal blue stripe in the center superimposed on a vertical red band, also centered; five white, five-pointed stars are arranged in an oval pattern in the center of the blue band; the five stars represent the five main islands of Bonaire, Curacao, Saba, Sint Eustatius, and Sint Maarten |
| New Caledonia | the flag of France is used |
| New Zealand | blue with the flag of the UK in the upper hoist-side quadrant with four red five-pointed stars edged in white centered in the outer half of the flag; the stars represent the Southern Cross constellation |
| Nicaragua | three equal horizontal bands of blue (top), white, and blue with the national coat of arms centered in the white band; the coat of arms features a triangle encircled by the words REPUBLICA DE NICARAGUA on the top and AMERICA CENTRAL on the bottom; similar to the flag of El Salvador, which features a round emblem encircled by the words REPUBLICA DE EL SALVADOR EN LA AMERICA CENTRAL centered in the white band; also similar to the flag of Honduras, which has five blue stars arranged in an X pattern centered in the white band |
| Niger | three equal horizontal bands of orange (top), white, and green with a small orange disk (representing the sun) centered in the white band; similar to the flag of India, which has a blue spoked wheel centered in the white band |
| Nigeria | three equal vertical bands of green (hoist side), white, and green |