Britain's sporting heroes will be saluted as a huge precession snakes its way through the streets of London.
Olympic and Paralympic heroes will be celebrated at the end of a sparkling summer of British sport.
On Sunday night the curtain came down on the Paralympic Games in a stunning closing ceremony and today the celebrations spill out onto the streets of the capital as tens of thousands are expected to turn out to watch The Greatest Team Parade.
Prime Minister David Cameron said that the "best ever" Olympic and Paralympic Games had given the country a "tremendous lift".
Athletes will travel on 21 open-top floats, grouped in alphabetical order by their sport. The parade will include more than 90% of Britain's medal winners.
The stars of the Olympics' Super Saturday will be on the first three floats. The first will include Mo Farah, the Olympic 5,000 and 10,000m winner, followed by heptathlon gold medallist Jessica Ennis, with long jump champion Greg Rutherford in the third float.
Team GB's cycling stars Sir Chris Hoy, Jason Kenny, Laura Trott and Victoria Pendleton will be in float seven, followed by double equestrian gold-medal winner Charlotte Dujardin, rowing champion Katherine Grainger, Ben Ainslie, Britain's most successful Olympic sailor, and triathlon gold medallist Alistair Brownlee.
Paralympians Hannah Cockcroft, Jody Cundy, Sophie Christiansen and Jonnie Peacock will also take part in the parade.
British Airways will lead a flypast with the Red Arrows during the event after receiving special permission to fly over The Mall. The flame-coloured Firefly A319 aircraft, which was used to bring the Olympic Flame to the UK at the start of the Games, will display a special "thank you" message on its underbelly.
Speaking ahead of taking part in the parade, diving bronze medallist Tom Daley said he expected London 2012 to be an inspiration to many. He told BBC News: "The range of different sports that we've competed in, the sports that aren't normally getting recognition have done really well at these Olympic Games. It's given people news ideas of new things to try."