Oscar Pistorius will be the first double amputee runner to take part in the Olympic Games.
The South African sprinter was chosen by his country to compete in the 400m race and the 4x400m relay at London 2012.
The 25-year-old had his lower legs amputated when he was 11 months old due to a congenital condition. He will also be included in the South African Paralympics squad.
"Today is truly one of the proudest days of my life," said Pistorius.
"It is a real honour and I am so pleased that years of hard work, determination and sacrifice have all come together."
There had been some doubt whether Pistorius would make the team as he failed to achieve the A standard time needed, but South Africa's Sports Confederation and the Olympic Committee felt that he would prove a good choice.
Pistorius is able to run using special prosthetic carbon fibre limbs. In 2008, he was allowed to compete against able-bodied athletes after it was ruled that his blades did not give him an unfair advantage on the track.
At the Paralympic Games he will take part in the 100m, 200m, 400m and 4x100m relay.
"I am also hugely excited to then be competing to defend my three Paralympic titles at the Paralympic Games," said Pistorius.
"I believe we will see some amazing times posted and I am very much looking forward to what will be an incredible Olympics and Paralympics in London."
The Olympic Games will start with an opening ceremony on July 27th, while the Paralympics will get underway on August 29th.
Anyone staying in central London hotels during the Games are reminded that there is a special website in operation by Transport for London to provide travel advice and tips on the best way to get to the Olympic venues.