| Country | Flag description |
| Antigua and Barbuda | red, with an inverted isosceles triangle based on the top edge of the flag; the triangle contains three horizontal bands of black (top), light blue, and white, with a yellow rising sun in the black band |
| Arctic Ocean | void |
| Argentina | three equal horizontal bands of light blue (top), white, and light blue; centered in the white band is a radiant yellow sun with a human face known as the Sun of May |
| Armenia | three equal horizontal bands of red (top), blue, and orange |
| Aruba | blue, with two narrow, horizontal, yellow stripes across the lower portion and a red, four-pointed star outlined in white in the upper hoist-side corner |
| Ashmore and Cartier Islands | the flag of Australia is used |
| Atlantic Ocean | void |
| Australia | blue with the flag of the UK in the upper hoist-side quadrant and a large seven-pointed star in the lower hoist-side quadrant known as the Commonwealth or Federation Star, representing the federation of the colonies of Australia in 1901; the star depicts one point for each of the six original states and one representing all of Australia's internal and external territories; on the fly half is a representation of the Southern Cross constellation in white with one small five-pointed star and four larger, seven-pointed stars |
| Austria | three equal horizontal bands of red (top), white, and red |
| Azerbaijan | three equal horizontal bands of blue (top), red, and green; a crescent and eight-pointed star in white are centered in red band |
| Bahamas, The | three equal horizontal bands of aquamarine (top), gold, and aquamarine, with a black equilateral triangle based on the hoist side |
| Bahrain | red, the traditional color for flags of Persian Gulf states, with a white serrated band (five white points) on the hoist side; the five points represent the five pillars of Islam |
| Bangladesh | green field with a large red disk shifted slightly to the hoist side of center; the red disk represents the rising sun and the sacrifice to achieve independence; the green field symbolizes the lush vegetation of Bangladesh |