A citizenship ceremony will be staged this week at Albert Hall – the same venue where the first citizenship ceremony in Australia took place in 1949.
Governor-General Sir Peter Cosgrove will preside over the event, where 72 people will be granted Australian citizenship.
On the 65th anniversary of Australian citizenship, about 200 people will become Australian citizens in ceremonies in Canberra.
Along with the event at Albert Hall on Wednesday, two citizenship ceremonies will be held on Monday (September 15) at Floriade and another on Friday at Telopea Park School.
The first Australian citizenship ceremony took place at Albert Hall in Canberra on February 3, 1949, when seven men representing each state and the ACT became citizens.
More than 4.5 million people have become citizens since Australian citizenship was introduced.
Australian Citizenship Day is celebrated each year on September 17.
The Department of Immigration and Border Protection says it is an opportunity for all Australians to take pride in citizenship and reflect on the importance of being Australian.
More than 5000 people from 123 countries are expected to become Australian citizens across the country at more than 90 ceremonies during the week.
As well, a large number of people become Australian citizens in the hundreds of ceremonies held around the country on Australia Day.
In January, the Prime Minister presided over Canberra's Australia Day citizenship ceremony at Rond Terraces, where 24 people from 12 countries became Australian citizens.
A department official said the Prime Minister was not expected to attend Wednesday's event at Albert Hall.