Flag of Guinea-Bissau
| Use | National flag and ensign |
|---|---|
| Proportion | 1:2 |
| Adopted | 24 September 1973 (de facto) 10 September 1974 (de jure) |
| Design | One vertical red line on the hoist side charged with a black five-pointed star; two horizontal lines on the fly side (yellow and green) |
The national flag of Guinea-Bissau was adopted on 24 September 1973, the day the country proclaimed its independence from Portugal.