The "Reclaim Australia" events drew hundreds of supporters but also triggered counter-rallies from other groups who criticised them as racist and called for greater tolerance.
"We are pro-Australian values and anti-extreme Islam, but we're not anti-Muslim," Reclaim Australia spokeswoman Catherine Brennan told AFP, adding there was no racism behind the rallies, which she said had attracted people from diverse backgrounds.
"Since when is it being racist to love your country and to love the values and culture that you've been brought up with?"
"We're against the extremists of one particular religion," he said.
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"I know in Sydney and Melbourne they've got Muslims already signed on to attend because they can see what's happening and they don't like what's happening."
In Sydney, hundreds braved the rain to rally in Martin Place, near the site of a deadly siege in which a lone gunman inspired by the Islamic State group took customers and staff hostage in a cafe in December. Two people, and the gunman, were killed in that incident.
"We have people here today who stand against racism. So do I," Hanson said.
However, rival protesters called the Reclaim Australia rallies anti-Muslim.
"Events like theirs incite racism and violence against Muslims," Clare Fester, who organised the counter-protest in Sydney said in statement.