No, David Beckham's not one of them, sadly. But this is your chance to see one of the teams that could win the 2014 World Cup and the future stars of the current World and European Champions.
Brazil have already made it clear that their Olympic team will form the basis of their World Cup squad.
Many people will be watching to see if Spain can make it a three-timer in world football by adding Olympic Gold to the other two major trophies they hold.
And while Team GB looks like it lacks sparkle thanks to Stuart Pearce's short-sightedness, Uruguay and Mexico are not just there to make up the numbers.
For some people the Olympic football is a mere sideshow, coming a poor fourth to the two major trophies and the top European leagues.
They might also forget that there is a women's tournament going on here (though that is not likely in the US, where their women are arguably the best footballing nation ever).
So to save you from synchronised swimming, dressage and archery, what is there to look out for in the Olympic football?