Crackerjack is a British children's television series which was initially aired on the BBC Television Service between 14 September 1955 and 21 December 1984 (with no series in 1971). The series was a variety show featuring comedy sketches, singers and quizzes, broadcast live with an audience.On 11 February 2019, it was announced that Crackerjack would return in 2020, 35 years after it was last aired. It was hosted by Sam & Mark, with an exclamation mark added to its original title, and aired on CBBC from 17 January 2020. The second revived Crackerjack! series was confirmed to start filming in October 2020. In 2022, it was reported that the show had been cancelled.

Its initial long run featured Eamonn Andrews, Max Bygraves, Leslie Crowther, Ed "Stewpot" Stewart, Joe Baker, Jack Douglas, Stu Francis, Peter Glaze, Don Maclean, Michael Aspel, Christine Holmes, Jacqueline Clarke, Stuart Sherwin, Little and Large, Jan Hunt, The Krankies, Basil Brush, Geoffrey Durham, Bernie Clifton, Rod McLennan and Ronnie Corbett, amongst many others.

Performers who appeared as singers/dancers, assisting the host with games, included Sally Ann Triplett (Series 26; as a member of the duo Bardo, Triplett represented the United Kingdom in the Eurovision Song Contest 1982), Leigh Miles (Series 26–27; Miles was also a popular Hill's Angel in The Benny Hill Show), Julie Dorne-Brown (Series 27–28; later MTV VJ "Downtown" Julie Brown), Sara Hollamby (Series 28–29; now a television news and travel reporter), Ling Tai (Series 29), Jillian Comber and Pip Hinton.