Circular Quay is set to be overrun by Santas of all shapes and sizes in the seventh annual Variety Santa Fun Run.

More than 5,000 jolly red suits will tackle the accessible 5 km course in a bid to raise $250,000 for Variety, the Australian charity supporting sick and disadvantaged children across the country.

Aside from the main event, a giant snow dome, snow machines, a Christmas-themed village and DJs will be on offer for all.

Variety are calling on the public to rally workmates, friends and families to take part in the spirit of giving by dressing as a ‘Claus for a cause’.

The Variety Santa Fun Run comes to Sydney on Sunday December 6. To register and for more information visit the website.