Cardboard Cavalier is a 1948 British historical comedy film directed by Walter Forde and starring Sid Field, Margaret Lockwood and Jerry Desmonde.

[2] In an England under the rule of Oliver Cromwell, London barrow boy Sidcup Buttermeadow is unwittingly used as a spy for the exiled Charles II to deliver messages to his royalist supporters, and is aided by the object of his affection, Nell Gwynn.

[3] Dressed as a Cavalier, Sidcup is pursued by Roundhead troops, but evades them with the help of a variety of people and a ghost.

The critic Derek Winnert noted that the film was "well timed, sprightly and funny, and exuberantly played by a welcome vintage cast, as well as amusingly written by Noel Langley and nicely directed by the comedy expert Forde.

"[15] Variety spoke of Langley's script "blend[ing] comedy, bathos and sheer slapstick with skill and ingenuity" and also highlighted Lockwood as playing her role with "great gusto...verve and vivacity".