Rallies, ceremonies and other events were held across the country on Friday, calling for a change to the date of Australia's national day, as well as honouring the resilience and strength of First Nations communities.
In Boorloo/Perth, thousands gathered in the heart of the city.
One rally speaker, Noongar man Herbert Bropho, pointed out one man carrying an Australian flag who walked through the crowd.
"Your flag represents a colony that doesn't recognise us, we are not recognised in your constitution, we are not recognised in your group," he noted.
"Where is my home? I am the first Australian and I always will be the first Australian… I am so proud to be an Australian, to get that privilege is to stand with us."
Noongar law academic Hannah McGlade said the genocide in Australia "is very real and it is an ongoing process".
"We still have so much to do in terms of Indigenous respect in this country," Dr McGlade told the crowd.
"I ask you to stand in support of Indigenous people to ensure our rights are properly respected, there's too much lip service and we know that the brutality goes on."
Noongar man Fabian Yarran told the rally that the "ultimate aim of settler colonialism is to gain more control of our land and natural resources and put the First Nations people, Aboriginal people under their control".
"It's similar to what's happening in Gaza with the Palestinians… We can understand what's going on over there because it has happened to us," he said.
Events and rallies were also held in New South Wales, Victoria, Queensland, Tasmania, South Australia, the ACT and the Northern Territory.