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 flag of the Commonwealth of Nations is flown at Marlborough House, London, the headquarters of the Commonwealth Secretariat, throughout the year, and for a limited period at other venues where Commonwealth meetings, events, or visits are taking place (for example, Commonwealth Heads of Government Meetings). The Canadian federal government does not stipulate that the flag be flown for Commonwealth Day, instead directing that the British Union Jack (officially called the Royal Union Flag) be flown at federal installations which have a second flagpole. Former Commonwealth Secretary-General Don McKinnon encourages the flying of the Commonwealth flag on Commonwealth Day, and