An Australian barber has decided to use his one day off each week to give free haircuts to homeless people as a way of giving back to society.

Nasir Sobhani, 26, is a recovering drug addict and works six days a week as a barber in Melbourne.

On his day off, he walks the streets offering up free haircuts and styles to those who are still struggling.

In a YouTube documentary produced by media network PLGRM about his mission, Mr Sobhani says he began his new endeavour to celebrate his return to health.

“It’s my way of giving back, it’s my way of repaying my gratitude for being sober and healthy again,” he said.

Mr Sobhani shares pictures of his customers on his Instagram page The Streets Barber along with a summary of their story.

He has over 47,000 followers on the account.

One post tells the story of 21-year-old Chris, who has been homeless since he was ten.

Sobhani cut Chris' hair and shared his story with his followers. (Instagram)

“He has no family which he can contact or be with - he has basically been entirely alone for the past 11 years,” Mr Sobhani wrote.

Chris was abused by both his father and step-father and was forced to leave home.

“It was difficult to shave his neck (under his chin) due to the open sores he had from the meth use but he insisted he wanted to clean up - so I did the best I could,” Mr Sobhani said.

“He looked at the mirror and was the happiest I had seen him since I had met him - which warmed my heart.

“He never got the chance to properly experience a childhood, let alone his youth.”

Mr Sobhani goes out of his way to strike up conversation with his clients to get them talking about their lives and situations.

Sobhani share before and after pictures of his clients on his Instagram page. (Instagram)

He hopes to instil hope in them that they can change their circumstances.

“I decided I’ll give free haircuts and offer companionship in hopes that they’ll feel good about themselves and believe they’re worthy enough,” he wrote on Instagram.