List of national flags by design

A national flag is a flag that represents and symbolizes a country or nation-state. Flags come in many shapes and designs, which often represent something about the country or people that the flag represents. Common design elements of flags include shapes — such as crescent moons, crosses, stars, stripes, and suns — layout elements such as including a canton (a rectangle with a distinct design, such as another national flag), and the overall shape of a flag, such as the aspect ratio of a rectangular flag — whether the flag is square or rectangle, and how wide it is — or the choice of a non-rectangular flag. Sometimes these flags are used as a short-hand guide to represent languages on say, tourist information or versions of websites on internet.

Many countries with shared history, culture, ethnicity, or religion have similarities in their flags that represent this connection. Sets of flags in this list within the same category may represent countries' shared connections — as with the Scandinavian countries exhibiting the Nordic cross on their flags — or the design similarity may be a coincidence — as with the red and white flags of Indonesia and Monaco.

For clarity, unless stated, all flags shown are the civil flag of the nation state / country recognised as such by the United Nations — the state flags, (usually of the government), along with the flags of autonomous countries, regions, and territories of a UN nation state will be annotated in italics as such.