Anti-immigration rallies, which have been linked to white-nationalist extremists, will take place across several capital cities on Sunday.
March for Australia, the group behind the demonstrations, says they will demand the federal government brings an end to mass migration.
Anti-racism and pro-Palestine marches will take place at the same time in Sydney and Melbourne, which could see rival groups come face to face.
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Cops issue worrying warning
Cops have shared a worrying warning that violent scenes could break out at several of the anti-immigration rallies planned across Australia
Victoria Police said demonstrators 'who hold far-right ideologies and extreme views are likely to attend the March for Australia', while 'groups with opposing views are planning on attending specifically to confront the other protest'.
The police force has vowed to throw everything it has at the protests, with the riot squad to be deployed.
Officers will also have the power to search people for weapons in the CBD and order demonstrators to remove their face coverings.
NSW Police will be deploying 1,000 officers to patrol the city and ensure public safety.
Anti-immigration rally organisers hit back
Organisers of the March for Australia rallies have fired back at the Albanese government's claims of racism, and have vowed protests will remain peaceful unless counter-protesters show up and cause violence.
Politicians divided over rallies
The Albanese government has declared there is no place for hate in Australia.
Federal Opposition Leader Sussan Ley on Saturday called for calm and respectful behaviour ahead of the mass protests.
'In Australia, we protect the right to an opinion and the right to protest. But that must be done peacefully and respectfully. There is no place for violence, racism or intimidation,' she said.
'Whether incited from afar or stirred up here, we cannot let hatred and fear tear at our social cohesion.
'Strong borders keep us safe, but they also allow us to be generous and compassionate to those fleeing conflict.
'That is the Australian story. Respect, tolerance, community. It belongs to all of us, and what unites us will always be stronger than what seeks to divide us.'
