Flag of Monaco
| Use | National flag |
|---|---|
| Proportion | 4:5 |
| Adopted | 4 April 1881 |
| Design | A horizontal bicolour of red and white |
| Use | State and war flag, state and naval ensign |
| Design | A white field with the coat of arms charged at the center |
| Use | National flag and civil ensign |
| Design | A white field with red lozenges |
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The national flag of Monaco (French: drapeau national de Monaco) has two equal horizontal bands, of red (top) and white (bottom), both of which have been the heraldic colours of the House of Grimaldi since at least 1339. The present bicolour design was adopted on 4 April 1881, under Charles III.