Carry On Jack is a 1964 British comedy film, the eighth in the series of 31 Carry On films (1958–1992). Most of the usual Carry On team are missing from this film: only Kenneth Williams and Charles Hawtrey appear throughout, with Jim Dale making a cameo appearance as a sedan chair carrier. Bernard Cribbins makes the first of his three appearances in a Carry On. Juliet Mills, Donald Houston and Cecil Parker make their only Carry on appearances in this film. Carry On Jack was the second of the series to be filmed in colour and the first Carry On film with a historical setting and period costumes.

As with its immediate predecessor, the script for Carry on Jack started off as a non-Carry On film (originally entitled Up the Armada) and after a number of title changes was incorporated into the series. The film was followed by Carry On Spying 1964.