| Country | Flag description |
| Barbados | three equal vertical bands of blue (hoist side), gold, and blue with the head of a black trident centered on the gold band; the trident head represents independence and a break with the past (the colonial coat of arms contained a complete trident) |
| Belarus | red horizontal band (top) and green horizontal band one-half the width of the red band; a white vertical stripe on the hoist side bears Belarusian national ornamentation in red |
| Belgium | three equal vertical bands of black (hoist side), yellow, and red note: the design was based on the flag of France |
| Belize | blue with a narrow red stripe along the top and the bottom edges; centered is a large white disk bearing the coat of arms; the coat of arms features a shield flanked by two workers in front of a mahogany tree with the related motto SUB UMBRA FLOREO (I Flourish in the Shade) on a scroll at the bottom, all encircled by a green garland |
| Benin | two equal horizontal bands of yellow (top) and red (bottom) with a vertical green band on the hoist side |
| Bermuda | red, with the flag of the UK in the upper hoist-side quadrant and the Bermudian coat of arms (white and green shield with a red lion holding a scrolled shield showing the sinking of the ship Sea Venture off Bermuda in 1609) centered on the outer half of the flag |
| Bhutan | divided diagonally from the lower hoist-side corner; the upper triangle is yellow and the lower triangle is orange; centered along the dividing line is a large black and white dragon facing away from the hoist side |
| Bolivia | three equal horizontal bands of red (top), yellow, and green with the coat of arms centered on the yellow band note: similar to the flag of Ghana, which has a large black five-pointed star centered in the yellow band |
| Bosnia and Herzegovina | a wide medium blue vertical band on the fly side with a yellow isosceles triangle abutting the band and the top of the flag; the remainder of the flag is medium blue with seven full five-pointed white stars and two half stars top and bottom along the hypotenuse of the triangle |
| Botswana | light blue with a horizontal white-edged black stripe in the center |
| Bouvet Island | the flag of Norway is used |
| Brazil | green with a large yellow diamond in the center bearing a blue celestial globe with 27 white five-pointed stars (one for each state and the Federal District) arranged in the same pattern as the night sky over Brazil; the globe has a white equatorial band with the motto ORDEM E PROGRESSO (Order and Progress) |