Flag of the Czech Republic
| Use | Civil and state flag, national ensign |
|---|---|
| Proportion | 2:3 |
| Adopted | 30 March 1920 (Czechoslovakia and later the Czech Republic) |
| Design | Two equal horizontal bands of white (top) and red with a blue isosceles triangle based on the hoist side. |
| Designed by | Jaroslav Kursa |
| Use | Unit colour |
| Proportion | 1:1 |
| Adopted | 1993 |
The national flag of the Czech Republic is the same as the flag of the former Czechoslovakia. Upon the dissolution of Czechoslovakia in December 1992, the Czech Republic kept the Czechoslovak flag while Slovakia adopted its own flag. The first flag of Czechoslovakia was based on the flag of Bohemia and was white over red. This was almost identical to the flag of Poland (only the proportion was different) officially adopted in 1919, so a blue triangle was added at the hoist in 1920. The flag was banned by the Nazis in 1939 as they established a government nominally in control of Bohemia and Moravia, and a horizontal tricolour of white, red, and blue was used for the duration of the war. The 1920–1939 flag was restored in 1945. The flag was one of the only three flags of a socialist country in Europe without its coat of arms placed on center, when it was still part of Czechoslovakia at that time.