Marathon Health chief executive officer Megan Callinan, chief operations officer Justine Summers and chief financial officer Ron Charlton are all participating in this year's Vinnies CEO Sleepout.

On June 17 they'll join other CEOs, business owners and leaders sleeping outdoors.

"We wanted to do something really visible to show our support and raise money for people experiencing homelessness," Ms Callinan said.

"That's why we decided to participate in the CEO Sleepout - we'll experience first-hand what is unfortunately a way of life for too many people."

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St Vincent de Paul Dubbo member Dan Sullivan said the charity deeply appreciated the participation of the Marathon Health staff.

"Since January 1, 2021, Dubbo St Vincent de Paul care and support members... have supported over 300 people," he said.

"This includes 50 people who were homeless or in temporary accommodation."

The Marathon Health team hopes to raise $15,000 for St Vincent de Paul. More than $3000 has already been donated.

Mr Sullivan said every dollar raised would go to St Vincent de Paul to help provide crisis accommodation, food, healthcare, counselling, education, employment and support to find a permanent home.

He shared the story of Bill, who had recently been released from Macquarie Correctional Centre. With help from both Vinnies and Marathon Health, Bill was getting clean and on the journey towards finding permanent accommodation.

Marathon Heath's team lead - psychosocial Shana Turner said many people weren't aware of homelessness because the majority of it was hidden, with people couch surfing, staying in temporary accommodation or their cars.

"Homelessness is a critical issue for the communities we work in," she said.

"We see how difficult it is for clients who don't know where they'll be sleeping tonight. People we support are in this position due to a range of reasons such as crisis, difficulties navigating services, mental health concerns, domestic violence and unemployment."

To help the Marathon Health team reach their $15,000 target, go to ceosleepout.com.au and search 'Marathon Health'.

Their night taking part in the Vinnies CEO Sleepout will be documented via the Marathon Health social media channels for anyone who wishes to follow along.

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