Which country's national flag is known as the Dannebrog?

Denmark’s national flag is known as the Dannebrog.

The Dannebrog is a red flag with a white Scandinavian cross, a design shared in related forms by several Nordic countries. Danish tradition says the flag fell from the sky during the Battle of Valdemar in Estonia on 15 June 1219. Historians treat that story as a later legend, but the flag’s medieval history is unusually well documented.

The design became especially associated with the Danish monarchy and armed forces before spreading into widespread civilian use. Denmark’s flag is often described as the world’s oldest continuously used national flag, although the exact meaning of “oldest” depends on whether continuous official use or earliest surviving evidence is measured.

The name Dannebrog is commonly translated as “Danish cloth” or “Danish banner.” The cross is offset toward the hoist, a feature known as the Nordic or Scandinavian cross.