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Muscle car is a term used to refer to a variety of high performance automobiles. The term generally refers to American 2-door rear wheel drive mid-size cars, and sometimes full-size cars equipped with large, powerful, V8s, and sold at an affordable price for street use and both formal and informal drag racing.  It is a product of the American car industry adhering to the hot rodder's philosophy of taking a small car and putting a BIG engine in it.

The popularity and performance of muscle cars grew in the early 1960s, while Mopar (Dodge, Plymouth, and Chrysler) and Ford battled for supremacy in drag racing—the 1962 Dodge Dart 413 cu in (6.8 L) Max Wedge, for example, could run a 13-second 1/4-mile dragstrip at over 100 miles per hour (161 km/h). By 1964, there were Oldsmobile, Chevrolet, and Pontiac muscle cars in GM's lineup, and Buick joined them a year later. For 1964 and 1965, Ford had its 427 cu in (7 L) Thunderbolts, and Mopar unveiled the 426 cu in (7 L) Hemi engine. The Pontiac GTO was an option package that included Pontiac's 389 cu in (6.4 L) V8 engine, floor-shifted transmission with Hurst shift linkage, and special trim. In 1966 the GTO became a model in its own right. The project, spearheaded by Pontiac division president John DeLorean, technically violated GM's policy limiting its smaller cars to 330 cu in (5.4 L) displacement, but the new model proved more popular than expected and inspired GM and its competitors to produce numerous imitators. The GTO itself was a response to the Dodge Polara 500 and the Plymouth Sport Fury, which in 1962 had been shrunk to intermediates—at a time when bigger was considered better.

Although the sales of true muscle cars were relatively modest by total Detroit production standards, they had value in publicity and bragging rights. Competition between manufacturers meant that buyers had the choice of ever-more powerful engines—a horsepower war that peaked in 1970, with some models offering as much as 450 hp (336 kW) (with this and others likely producing as much or more actual power, whatever their rating).