The image, captured by photographer Millie Pilkington, was taken as the King returned to public duties following his cancer diagnosis and treatment.
The palace said the card reflects the moment life was beginning to return to normality.
The photograph is also a more informal picture than the one chosen for Christmas 2023.
Last year’s picture was captured by Hugo Burnand and showed the royal couple in the Throne Room at Buckingham Palace following the coronation.
The couple were standing side-by-side, with King Charles pictured wearing the Imperial State Crown and Queen Camilla wearing Queen Mary’s Crown.
Christmas images used to decorate official festive cards are regularly released by senior members of the Royal Family.
It will take Charles and Camilla several days to personally sign all the cards. There will be around 2,700 which will be sent to people across the globe including family, friends, world leaders and organisations.
