Union Jack Union Jack The Union Jack, or Union Flag, is the national flag of the United Kingdom. The flag also has an official or semi-official status in some other Commonwealth realms: for example, it is a ceremonial flag in Canada by parliamentary resolution, and known there as the Royal Union Flag. Further, it is used as an official flag in some of the smaller British overseas territories. The Union Flag also appears in the canton (upper left-hand quarter) of the flags of several nations and territories that are former British possessions or dominions, as well as the state flag of Hawaii.
Union Jack the decision to fly the flag may be made by each government department. Previously the flag was generally only flown on public buildings on days marking the birthdays of members of the Royal Family, the wedding anniversary of the monarch, Commonwealth Day, Accession Day, Coronation Day, the Queen's Official Birthday, Remembrance Sunday, and on the days of the State Opening and prorogation of Parliament. The Union Flag is flown at half mast from the announcement of the death of the Sovereign (save for Proclamation Day), or upon command of the Sovereign. The current flag days where the Union Flag should