A muscle car spoiler is a car spoiler attached on a muscle car, which is a term for high-performance cars, primarily American models produced between 1964 and 1974. Muscle car spoilers make the vehicle unique and stand out in the crowd. Often with flashy, sporty styling, these mid-sized cars have special trims and large powerful engines (V8 engines). The special trims are intended for utmost acceleration on the street or in drag racing competition.

The muscle car models initially sported only rear spoilers. The construction of front spoilers not only enhanced the appearance, but also added functionality in terms of aerodynamic design. The muscle car spoilers, both frontal and rear spoilers, are usually molded into the bumper caps. This arrangement helps to reduce the car's lift and drag and increase its downforce. Subsequently, these would ensure increase in traction, permitting the car to brake, turn, and accelerate properly and more forcefully.

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Muscle car spoilers come in various sizes, shapes, and materials. In early cars, spoilers were made of plastic. Those were not fit to survive the constant exposure of UV rays of the sun. The spoilers are now made from polyurethane, which are durable and sturdy materials. A few are also made from lightweight steel or fiberglass. A car with a good spoiler means that there is less resistance, which would result in a higher top speed.

Some of the muscle car models that come with spoilers include the Pontiac Tempest Le Mans GTO, the Buick Riviera Gran Sport, the Dodge Charger, the Chevrolet Chevelle Malibu SS, and Oldsmobile Cutlass 442. The Pontiac Tempest installed its first rear spoiler in 1969, along with other accessories such as decals, and a 366 horsepower, Ram Air III V8. The Dodge Charger Daytona built in 1969 features front spoiler and a huge rear deck spoiler.