Flags with the color Red; All the flags from WorldFlags.net that uses the color Red.
Many flags may perhaps not be seen as red thanks to many other dominating colors. But due to the fact that people are searching for some flag they can't remember the name of - but has the color Red on it - we therefore choose to publish all flags that have Red some where on the flag.
Red is really a popular color among the world flags. It is often a symbol of historic blood, the sun or the soil.
Some flags, like the Vatican flag, do have some red in the cote of arms but red it's not one of the primary colors.