Voters in favour of an Indigenous voice to parliament are in the minority as support for the constitutional change wilts in the polls.

The share of people nationally who approve of enshrining the voice in the constitution has dropped to 49 per cent, down from 53 per cent in May, according to a Resolve Strategic survey.

The figures come despite the Yes 23 Campaign hailing the support of more than 500 organisations, from charities to business, faith and multicultural groups, as backing a ‘yes’ vote.

The poll of 1606 voters, published by Nine newspapers late on Monday, showed those backing the ‘no’ case were in the majority in three states, Queensland, Western Australia and South Australia.

It is the first major national poll to show the ‘no’ side leading.

The national ‘yes’ figure has steadily dropped from a peak of 64 per cent support in a September 2022 Resolve survey.

The latest survey showed 18 per cent of voters were undecided, while 42 per cent were firmly in favour and 40 per cent against.

But when those who were undecided were asked to answer only ‘yes’ or ‘no’, as they would in a referendum, the ‘no’ vote had a slender lead.

Yes 23 Campaign director Dean Parkin said voice supporters continued to hit the phones and hold events to encourage people to get behind the constitutional change.

“This is about bringing all Australians together,” he said.

“We are building a positive movement that includes people from all walks of life.”

-AAP