Rover is a plot device from the 1967 British television programme The Prisoner, and was a crucial tool used to keep 'prisoners' from escaping the Village. It was depicted as a floating white balloon that could coerce, and, if necessary, incapacitate or kill recalcitrant inhabitants of the Village. It also had the ability to subdivide. Several aspects of the Rover device were left unexplained and to the imagination of the viewer.

The Prisoner is a British television series created by Patrick McGoohan, with possible contributions from George Markstein. McGoohan portrays Number Six, an unnamed British intelligence agent who is abducted and imprisoned in a mysterious coastal village after resigning from his position. The allegorical plotlines of the series contain elements of science fiction, psychological drama, and spy fiction. It was produced by Everyman Films for distribution by Lew Grade's ITC Entertainment.