Gallery: Team GB hopes for gold
Isle of Mann born, Mark Cavendish could win Britain's first medal in the road cycling event on 28th July.
After four stage wins in the 2008 Tour de France his eminence as a world class rider was sealed when he became the first Brit to win the green Jersey.
This year he has been supporting Bradley Wiggins is his Tour de France win but now all eyes will be on London 2012.
Hannah Miley will also be performing on the first day of the Olympics as she tackles the 400m medley on 28th July.
Hannah still trains at Inverurie pool, the place where she learnt to swim, under the watchful eye of her father - who is also her coach.
He surprised the world when he took a bronze medal in the 2008 Beijing Olympics, but Louis Smith has set his sights high for 2012.
The gymnast is planning something very special for the Olympics and intends to go for one of the most difficult moves on the pommel horse - the Triple Russian.
Mo Farah is hoping to make up lost chances in the 10,000m on 4th August. He competed in Beijing but failed to make it in to through to the final.
In the last four years he has been working hard, winning silver at the European Cross Country Championships and smashing the 3000m indoor record.
After returning home from Beijing one of the heroes of 2008 Rebecca Adlington won't want to disappoint in the 400m freestyle on 29th July.
She has continued to dazzle over the last four years, winning medals at the Commonwealth Games and the World Championships.
Tom Daley is already a star of the London Olympics, he will aim to win an individual medal on 11th August and synchronised with Pete Waterford on 30th July.
It has been a difficult period between his first Olympic appearance in Beijing (aged just 14) after the loss of his father Robert and injury hampered his performances.
But now Tom's partnership with Pete is expected to bring spectacular results.
Great things are expected from the whole of the Team GB equestrian team who are competing on 31st July.
Between the winner of both Burghley (2011) and Lexington (2012), William Fix-Pitt; Mary King making her sixth Olympic appearance and 2006 World Champion Zara Phillips, the team is one of the most impressive to be coming to London 2012.
Jessica Ennis has become one of the most well known faces of London 2012. Stress fractures in her foot meant she missed not only the Beijing Olympics but the entire 2008 season. Since then she has become European (2010) and World (2009) champion, she will be hoping to add Olympic champion to that list on 4th August.
Ben Ainslie was the first person to carry the Olympic Torch when it arrived at the beginning of the Relay at Lands End. With three Olympic sailing titles to his name - will he take another? Watch him on 5th August.
Andy Murray's commitment was evident when he lost the 2012 Wimbledon final to Roger Federer, but will that mean he has the drive to make his Olympics count? With Beijing winner Rafael Nadal pulling out because of fitness fears, Murray could have the best chance yet to become Olympic champion. The tennis finals will be on 5th August.
Beth Tweddle has amassed more titles and medals than any other British gymnast, this double Olympian is going in to win. She will be one of the oldest competitors and after a ten year career we are expecting Beth Tweddle to go out with a bang.
Watch the uneven bars final on 6th August.
Four time Olympic champion Chris Hoy is not to be under-estimated. With four golds and one silver to his name and having won three gold in Beijing he is a strong contender. He will compete on 6th August.
These remarkable brothers live and train together it will be hard to separate these two but we can expect great things from both.
Alistair is double world champion and Jonathan is the current World Sprint Champion. At number one and two in the world Team GB could be in for a two medals in the triathlon.
Wacth the Brownlee brothers run, swim and ride on 7th August.
Shanaze suffered a bitter blow in Beijing in 2008 when she battle her way to the final only to crash out very near the finishing line. Shanaze will ride on 10th August.
Alison Williams comes to London for her fourth Olympics.
After taking bronze in Athens, Alison has fought hard during all her Olympic appearances.
With a lot of near misses Alison will be hoping to aim true on 29th July.
The first time woman's boxing appears as an Olympic sport and there are high hopes for Nicola Adams.
The current European Champion at 51-kg and three-time World Championships silver medallist, Adams is Britain's most decorated female boxer. Watch her go for gold on 9th August.
Denied the gold in Beijing by just 5cm Philips was hoping to claim the number one spot in London, but questions over his fitness have led to fears that he may not be able to compete in the triple jump.
If he does compete you the triple jump finals are on 9th August.