A rumble seat, dicky seat, dickie seat or dickey seat is an upholstered exterior seat which hinges or otherwise opens out from the rear deck of a pre-World War II automobile, and seats one or more passengers. An 1899 Century Dictionary describes a rumble as " A seat for servants in the rear of a carriage". Roadster, Coupe and Cabriolet auto body styles were offered with either a luggage compartment or a rumble seat in the deck. Models equipped with a rumble seat were often referred to as a sport coupe or sport roadster.

Rumble seat passengers were essentially seated out in the elements, and received little or no protection from the regular passenger compartment top. 
Although the last cars built with a rumble seat were manufactured in the 1930s, a scottish company designed and sold a rumble seat for the MGA.