Men's Eight rower Alex Partridge, one of the Olympians who has reportedly had his bronze medal stolen, took to social networking site Twitter to appeal for information to find his medal.
Two Olympic medal winners have had their London 2012 medals stolen during an event in the capital.
Hockey player Hannah MacCload and rower Alex Partridge both had their bronze medals taken from the event in Mayfair in the early hours of yesterday morning.
The Metropolitan Police are investigating.
The theft came just hours after the Queen hosted a reception at Buckingham Palace to celebrate the achievements of all the London 2012 athletes.
31-year-old Alex Partridge who won bronze as part of the men's eight rowing team tweeted that his Olympic blazer as well as his medal had been stolen. Hannah Macleod then tweeted: "My medal was also stolen at the same time. Totally devastated."