Olympic champion Cathy Freeman has called on “all Australians” to vote Yes for an Indigenous Voice to Parliament while declaring her support.

The 400-metre sprinter, who won gold at the 2000 Olympics, made a pitch to the nation in a video for the official Yes campaign late on Tuesday.

Freeman referred to the urgency of the referendum on October 14 and said there was “strong” momentum behind the Voice.

The gold medallist, who won the nation’s heart at the Sydney Olympics, said the historic vote could be the moment that brought Australians together.

And she said a positive outcome would make a huge difference to the lives of people “who need it most”.

“I can’t remember a time when change has felt so urgent, where momentum has been so strong,” Freeman said.

“From small towns to big cities, something is in the air. I know all Australians feel it too.

“We have the chance to be part of a moment that brings people together, to work hard for something that we can all believe in.

“Right now, each of us can be part of something that really matters.

“To stand together and to show our support for Australians who need it the most.

“To recognise Indigenous peoples in our constitution for the very first time.

“To give our kids the very best start in life, an equal start in life. And to open our hearts and change our future.

“I‘m voting yes, and I am asking that all Australians do too. So please stand with me and write Yes on October 14.”

Freeman is the latest high-profile Australian to declare a position for the Yes campaign.

These include comedian Celeste Barber, actor Cate Blanchett and sports stars Ash Barty, Adam Goodes, Johnathan Thurston and Evonne Goolagong-Cawley.

Last week Celeste Barber posted a photo of the word ‘Yes’ written on her palm and told her nine million followers she supported the Voice.

“I’ll be voting YES for a voice to Parliament in the upcoming referendum,” she wrote.

“The Voice will give Aboriginal and Torres Strait Islander people a say on the issues that affect their communities.

“More than 80 per cent of Aboriginal and Torres Strait Islander people support the Voice to Parliament.

“The idea came directly from Indigenous communities, not politicians.

“The current approach is not working.”

To pass, the referendum needs a double majority – more than half of all voters and four of the six states need to vote in favour of the proposal.

But polls have consistently shown the Yes side is on track for defeat as the federal government struggles to convince voters to back the change.