Fantasy Flag Ideas: 20 Flag Concepts for Worldbuilders

Short answer: a convincing fantasy flag starts from the faction's story, uses two or three colors, one layout and at most one symbol. Below are 20 ready-to-build concepts – each lists the colors, layout and symbol so you can recreate it in a couple of minutes in the fictional country flag generator and adapt it to your world.

Kingdoms and empires

1. The Sun Throne – gold sun on a deep red field, 2:3. An old, wealthy monarchy that claims divine right.
2. The Northern Crown – white Nordic cross on slate blue, with a small gold crown in the canton. A cold kingdom proud of its alliances.
3. The Iron March – black and grey horizontal bicolor with a white bolt at the hoist. A militarized border province.
4. The Verdant Realm – green field with a gold border and a white tree in the center. A forest kingdom ruled by an elder council.
5. The Twin Empire – quartered red and white with a gold diamond in the center. Two crowns united by marriage.

Republics and city-states

6. The Free Harbor – vertical tricolor of navy, white and teal with white waves on the center band. A merchant republic of sailors.
7. The Mountain League – white field with a green mountain and a red horizontal band below. A confederation of highland cantons.
8. The Revolutionary Commune – red field with a large white star at the hoist and a black chevron. A young state born from an uprising.
9. The Desert Concord – ochre and crimson diagonal split with a white crescent. Caravan cities bound by trade law.

Guilds, orders and factions

10. The Mages' Circle – purple field, gold ring centered, 1:1. A scholarly order that values balance.
11. The Silver Watch – black field with a white eye. An intelligence service that sees everything.
12. The Shield Brotherhood – blue field with a white shield, 3:5. A knightly order of protectors.
13. The Merchant Compact – gold and green bicolor with a white diamond. Bankers and traders.
14. The Ash Covenant – charcoal field with a red leaf. Druids who survived a great fire.
15. The Free Company – red and black saltire with a white star in the center. Mercenaries loyal to coin.

Sci-fi and far-future

16. The Solar Federation – navy field with a ring of white stars and a gold compass star. A union of colonies.
17. The Outer Belt Cooperative – orange and black diagonal with a white triangle. Miners on the edge of the system.
18. The Machine Directorate – grey square field with a cyan square inside a white ring. A cold, logical regime.
19. The Terraform Union – green and red horizontal bicolor with a white mountain. Settlers turning a red planet green.
20. The Exodus Fleet – black field with a white crescent and a small star, 1:2. A people living on starships.

How to adapt these ideas

Treat each concept as a starting point, not a finished flag. Change one thing to make it yours:

• Swap the symbol for something from your world's history – a mountain where a battle took place, a wave for a coastal founding.
• Shift the colors to match the faction's culture: warm earth tones for desert peoples, cold blues for northern ones, rich purples and golds for old aristocracy.
• Change the ratio to separate cultures: square banners for one civilization, long 1:2 flags for another.
• Build families. Allies and successor states should share a layout or palette. Design the parent flag first, copy its share link, and make variants from it.

Making the flags feel real in your world

Readers and players notice when flags have a history. Decide who designed each flag, when it changed, and what the colors are said to mean. Older flags might carry more detail (a crown, a border) while newer revolutionary ones tend to be bolder and simpler – just as on Earth. Rival factions can use deliberately opposite colors. Occupied territories might fly the old flag in secret or add a black band of mourning.

For a D&D table, print faction flags as table tents with the printable flag page. For a campaign wiki or Discord server, animate them with the waving flag GIF maker. And if a flag starts to feel cluttered, run it past the five principles of good flag design – they apply just as well to imaginary nations as to real ones.