Diplomatic flag

A diplomatic flag is a flag used by a sovereign state engaging in diplomacy which is different from the nation's normal national flag. Some nations also have personal flags that are used by their diplomatic representatives, such as the U.S. Foreign Service flags.

National diplomatic flags

Currently, only two nations use diplomatic flags: Thailand and the United Kingdom. Different flags are used based upon the diplomatic rank of the mission. British High Commissions do not use diplomatic flags but rather the normal flag of [the United Kingdom], since members of the Commonwealth are not considered 'foreign' by the government of the United Kingdom.

Thailand

United Kingdom

Historical national diplomatic flags

Siam

Sweden and Norway

The members of the union between Sweden and Norway each had its own national flag, but the Union mark of [Norway and Sweden|Union mark] was used as the flag of their common diplomatic representations abroad.

Personal diplomatic and consular flags

The Gambia

Sierra Leone

United Kingdom

United States

Historical personal diplomatic flags

British Empire

Yugoslavia

The flag for the accredited representatives of the state of the Socialist [Federal Republic of Yugoslavia] was similar to the civil ensign, that is the national flag in 2:3 ratio.