Boston hockey player Hannah Macleod is one of two of Britain’s Olympic heroes who have reportedly had their medals stolen.
She was out celebrating with other Team GB members in the capital after a Buckingham Palace reception on Tuesday night when the bronze medal went missing.
Rower Alex Partridge also reported that his bronze medal has been taken.
Macleod took to her Twitter account to appeal for the medal's safe return.
“My medal was also stolen at the same time. Totally devastated,” she said, under the username @hannahmacleod6.
"I’m not after punishment. If you picked up a bronze Olympic medal that isn’t yours pls just send anonymously back to GB hockey-Bisham Abbey," she added.
Partridge, 31, tweeted that his Olympic blazer as well as his medal had been stolen from an event in Mayfair, central London.
A host of Olympic and Paralympic stars were invited to the palace to mark their achievements along with the Queen, Duke of Edinburgh, Duchess of Cambridge, Prime Minister David Cameron and London 2012 chief Lord Coe.
A Met spokesman said: “An Olympic medal and blazer were reported stolen from a venue in Mayfair in central London.
“It was believed the items were taken between midnight and 5am on Wednesday, October 24.”
Officers are continuing to investigate the incident but no arrests have been made.
Macleod, 28, achieved her bronze at London 2012 after Team GB’s women’s hockey team beat New Zealand to secure a medal.
Police say anyone with information should call the non-emergency number 101, or Crimestoppers anonymously on 0800 555 111.