The first G20 Leaders Summit protest was launched in Brisbane on Monday with more than 100 people campaigning for Aboriginal rights.
Under the banner, "Stop Stealing Our Children", the peaceful demonstration was focused on indigenous children who were still being taken from their families.
The group also highlighted the health problems suffered by Australian Aboriginals compared to other Australians.
The group marched through the city escorted by police, while a police helicopter hovered above.
Prof. Grace Smallwood, among Monday's protesters, said the G20 meeting provided a world stage where the Indigenous Australians could be told.
"The world press is here. They want to talk to first nation Australians (Aboriginal)," she told local radio.
"First nation Australian people are 2.7 percent of the population (but have) 14 times higher incarceration rates, our males dying 25 years before other Australians, our females 20 years before and our infant mortality rate is still very high."