Blue Peter viewers will be set the task of designing the official emblem for the Queen's diamond jubilee in 2012.
Children aged between six and 14 are being invited to take part in the UK-wide competition, with the winner to be announced in February 2011.
The chosen logo will feature on items ranging from crockery to London buses to mark 60 years of the Queen's reign.
Previous emblems for her silver jubilee in 1977 and golden jubilee in 2002 were created by professionals.
The emblem design will be chosen from the winners of three age categories - six to eight-year-olds, nine to 11-year-olds and 12 to 14-year-olds.
Entries cannot feature an image of the Queen, but must include a crown.
The competition will be judged by a panel including children's illustrators and Blue Peter staff, and will be overseen by British designer Martin Lambie-Nairn.
A Buckingham Palace spokesman said: "The official emblem will be available for use in the lead-up to, and during, the diamond jubilee for all activities associated with the celebrations including community and national events, as well as publications."
Queen Elizabeth II's reign began on 6 February 1952 following the death of her father George VI.
A series of events, including an extra bank holiday, are expected to mark her 60 years on the throne.
It will be only the second time that a British monarch has celebrated a diamond jubilee. Queen Victoria reached hers in 1897.
The emblem competition will be officially launched during Blue Peter on BBC One on Monday.
The deadline for entries, which must be submitted on a sheet of A4 paper, is 8 December.