English: This gallery contains the flags of states that were (at least de facto) independent in the past. The independence of many of these states has not been acknowledged, but the flags had been used as their state/national flags. Several of these flags are currently used, either by secessionist movements or officially by regional authorities. For historical flags of current countries, see w:Timeline of national flags
Inclusion of a flag here is not a guarantee of the authenticity of the flag.