| Country | Flag description |
| Cayman Islands | blue, with the flag of the UK in the upper hoist-side quadrant and the Caymanian coat of arms centered on the outer half of the flag; the coat of arms includes a pineapple and turtle above a shield with three stars (representing the three islands) and a scroll at the bottom bearing the motto HE HATH FOUNDED IT UPON THE SEAS |
| Central African Republic | four equal horizontal bands of blue (top), white, green, and yellow with a vertical red band in center; a yellow five-pointed star to the hoist side of the blue band |
| Chad | three equal vertical bands of blue (hoist side), yellow, and red note: similar to the flag of Romania; also similar to the flags of Andorra and Moldova, both of which have a national coat of arms centered in the yellow band; design was based on the flag of France |
| Chile | two equal horizontal bands of white (top) and red; a blue square the same height as the white band at the hoist-side end of the white band; the square bears a white five-pointed star in the center representing a guide to progress and honor; blue symbolizes the sky, white is for the snow-covered Andes, and red represents the blood spilled to achieve independence note: design was influenced by the US flag |
| China | red with a large yellow five-pointed star and four smaller yellow five-pointed stars (arranged in a vertical arc toward the middle of the flag) in the upper hoist-side corner |
| Christmas Island | territorial flag; divided diagonally from upper hoist to lower fly; the upper triangle is green with a yellow image of the Golden Bosun Bird superimposed, while the lower triangle is blue with the Southern Cross constellation, representing Australia, superimposed; a centered yellow disk displays a green map of the island note: the flag of Australia is used for official purposes |
| Clipperton Island | the flag of France is used |
| Cocos (Keeling) Islands | the flag of Australia is used |
| Colombia | three horizontal bands of yellow (top, double-width), blue, and red note: similar to the flag of Ecuador, which is longer and bears the Ecuadorian coat of arms superimposed in the center |
| Comoros | four equal horizontal bands of yellow (top), white, red, and blue with a green isosceles triangle based on the hoist; centered within the triangle is a white crescent with the convex side facing the hoist and four white, five-pointed stars placed vertically in a line between the points of the crescent; the horizontal bands and the four stars represent the four main islands of the archipelago - Mwali, Njazidja, Nzwani, and Mahore (Mayotte - territorial collectivity of France, but claimed by Comoros) note: the crescent, stars, and color green are traditional symbols of Islam |
| Congo, Democratic Republic of the | sky blue field divided diagonally from the lower hoist corner to upper fly corner by a red stripe bordered by two narrow yellow stripes; a yellow, five-pointed star appears in the upper hoist corner |
| Congo, Republic of the | divided diagonally from the lower hoist side by a yellow band; the upper triangle (hoist side) is green and the lower triangle is red note: uses the popular pan-African colors of Ethiopia |
| Cook Islands | blue, with the flag of the UK in the upper hoist-side quadrant and a large circle of 15 white five-pointed stars (one for every island) centered in the outer half of the flag |
| Coral Sea Islands | the flag of Australia is used |
| Costa Rica | five horizontal bands of blue (top), white, red (double width), white, and blue, with the coat of arms in a white elliptical disk on the hoist side of the red band; above the coat of arms a light blue ribbon contains the words, AMERICA CENTRAL, and just below it near the top of the coat of arms is a white ribbon with the words, REPUBLICA COSTA RICA |
| Cote d'Ivoire | three equal vertical bands of orange (hoist side), white, and green note: similar to the flag of Ireland, which is longer and has the colors reversed - green (hoist side), white, and orange; also similar to the flag of Italy, which is green (hoist side), white, and red; design was based on the flag of France |
| Croatia | three equal horizontal bands of red (top), white, and blue superimposed by the Croatian coat of arms (red and white checkered) |
| Cuba | five equal horizontal bands of blue (top, center, and bottom) alternating with white; a red equilateral triangle based on the hoist side bears a white, five-pointed star in the center |