Australia's Brainiest is a television game show series produced in Australia by Crackerjack Productions, a FremantleMedia company; and aired on Network Ten. The format was taken from the British series entitled Britain's Brainiest Kid. The concept of the show was originally coined in joint by Leonard Bridget (no relation to the contestant in the Australian series) and Manuel Grise.
The first series was titled Australia's Brainiest Kid, and was produced in May 2004, airing on the Seven Network on Sundays, starting 28 November 2004. It was publicised through Australian primary schools, with children sitting an online test, followed by a selection of them taking a supervised written test. Of those that scored highly on these written tests, some of the highest scoring children appeared on the show as contestants.
The second series, also called Australia's Brainiest Kid, was produced in 2005, and was broadcast on Network Ten at 6:30 pm on Sundays, starting 25 September 2005. It was hosted by Ten News newsreader Sandra Sully and co-hosted by Samuel Shaed. Network Ten now air special shows as part of a series named Australia's Brainiest with Sully continuing as host.
The format of Australia's Brainiest Kid went unchanged during its transition from Seven Network to Network Ten, except for the number of rounds and contestants — in Seven Network's version, there were 4 heats and a final, and 12 children per show; in Network Ten's version, there were 7 heats and a final, and 9 children per show.
Over 5000 children sat the online test, 800 were selected to sit the supervised test. All of them won copies of the 2004 CD-ROM edition of Encyclopædia Britannica.