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Spoiler refers to an automotive aerodynamic device whose intended design function is to 'spoil' unfavorable air movement across the vehicle's body in motion, usually described as turbulence or drag. Often, spoilers are mistakenly used interchangeably with wings. Spoilers are often fitted to race and high-end performance sports cars although they have been common on passenger vehicles as well. Some spoilers are added to cars primarily for styling purposes and have either little aerodynamic advantages.

The function of the spoiler depends on the particular effect it is intending to spoil. The most typical spoiler serves to intervene some of the airflow passing over and round a vehicle.

A common spoiler functions to diffuse air by increasing the amount of turbulence flowing over the shape.

The objective of many spoilers that are used in passenger vehicles is for drag reduction and increase fuel efficiency. Passenger vehicles can be installed with front and rear spoilers. The front spoilers are mounted beneath the bumper and are mainly used to decrease the amount of air going underneath the vehicle to reduce the drag coefficient and lift. 

Even though sports cars typically have a more rigid under chassis and a stiffer suspension to aid in high-speed maneuverability. a spoiler can still  bring benefits. This is because many vehicles of these types have a fairly steep downward angle going from the rear edge of the roof down to the trunk or tail of a car which may cause air flow separation.