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.
Flag of the Commonwealth of Nations the Office of the Secretary-General notes that "it is not the case that the Union Jack – or the flag of any other member country for that matter – is a substitute for the Commonwealth flag which represents the association of 53 members and their peoples." Elsewhere, the Commonwealth flag is flown at the Scottish Parliament Building in Edinburgh on Commonwealth Day, from the fourth flagpole in addition to the Union Flag, the Scottish saltire and the European Union flag which all fly daily. Since 2002 the Commonwealth flag has been flown alongside the Union Flag, over the Northern Ireland