The Rover P4 series was a group of saloon automobiles produced by the Rover Company from 1949 through to 1964 designed by Gordon Bashford. The P4 designation is factory terminology for the group of cars and was not in day-to-day use by ordinary owners, who would have used the appropriate consumer designations for their models (such as 60, 75, and 90). Additionally the P4 shape assisted in the creation of 'Jet 1' - the Rover Company’s foray into Jet powered vehicles. The Rover Jet technology was later used by the Rolls Royce Company, becoming the Rolls Royce Jet Engines we see on aircraft today. The original Jet 1 is on display in the London Science museum.

The cars used a Rover engine in 4- or 6-cylinder form which came from the 1948 P3 and had overhead valves for inlet and side valves for exhaust. A four-speed manual transmission was used with a column-mounted shifter at first and floor-mounted.

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