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 Union Jack was treated as its official flag. The continued use of the Union Jack as national flag became an issue in the 1920s, when the government proposed to introduce a National Flag of the Union. A compromise was reached in which both flags were flown on official buildings. The Union Nationality and Flags Act 1927 provided that the flags of the Union were (a) the Union Jack, to denote the association with the other members of the British Commonwealth of Nations, and (b) the new National Flag. The Union Jack was to be flown alongside the National Flag