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The current flag of the Australian Capital Territory was officially adopted by the Australian Capital Territory Legislative Assembly in 1993. The flag differs from the Australian state flags as it is not a modified (technically defaced) British Blue Ensign. It is similar in design to the flag of the Northern Territory. The flag uses the Canberra city colours of blue and gold (which also happen to be the heraldic colours of Australia). The Southern Cross appears as five white stars on a blue panel at the hoist, whilst in the centre of the goldfield in the fly is the modified Coat of arms of the Australian Capital Territory. The flag was designed by Ivo Ostyn. Even though the Australian Capital Territory has existed since 1909 and was given self-government in 1989, it had never had a flag of its own. Consequently, the government decided that the Territory should adopt a flag. In 1988 and 1992 competitions for a proposed new flag were held, in which artists and residents of the ACT could put forth their designs for the new flag. Subsequently, the current flag won the competition. The ACT Legislative Assembly then officially adopted this flag in 1993.

Source: Wikipedia