Pontiac is a brand of automobiles first produced in 1926, and sold in the United States, Canada and Mexico by General Motors (GM), marketed as an "athletic" brand specializing in mainstream performance vehicles.

On April 27, 2009, amid ongoing financial problems and restructuring efforts, GM announced that it would phase out the Pontiac brand by the end of 2010 and focus on four core brands in the U.S.: Chevrolet, Cadillac, Buick, and GMC.

1926-1942

Pontiac began by selling cars offering 40 hp (30 kW) 186.7 ci (3.1 liter) (3.25x3.75 in, 82.5x95mm) L-head straight 6-cylinder engines in the Pontiac Chief of 1927; its stroke was the shortest of any American car in the industry at the time. The Chief sold 39,000 units within six months of its appearance at the 1926 New York Auto Salon, hitting 76,742 at twelve months. The next year, it became the top-selling six in the U.S., ranking seventh in overall sales. By 1933, it had moved up to producing the cheapest cars available with straight eight-cylinder (inline eight) engines. This was done by using many components from the 6-cylinder Chevrolet, such as the body. In the late 1930s, Pontiac used the so-called torpedo body of the Buick for one of its models, just prior to its being used by Chevrolet. This body style brought some attention to the marque.

For an extended period of time—prewar through the early 1950s—the Pontiac was a quiet, solid car, but not especially powerful. It came with a flathead (side-valve) straight eight. Straight 8s were slightly less expensive to produce than the increasingly popular V8s, but they were also heavier and longer. Additionally, the long crankshaft suffered from excessive flex, restricting straight 8s to a relatively low compression ratio with a modest redline. However, in this application, inexpensive (yet very quiet) flatheads were not a liability.

1946-1954

From 1946-1948, all Pontiac models were essentially 1942 models with minor changes. The Hydra-matic automatic transmission was introduced in 1948 and helped Pontiac sales grow even though their cars, Torpedoes and Streamliners, were quickly becoming out of date.

The first all-new Pontiac models appeared in 1949. Newly redesigned, they sported such styling cues as lower body lines and rear fenders that were integrated in the rear-end styling of the car.

Along with new styling came a new model. Continuing the Native American theme of Pontiac, the Chieftain line was introduced to replace the Torpedo. These were built on the GM B-Body platform and featured sportier styling than the more conservative Streamliner. In 1950, the Catalina trim-level was introduced as a sub-series.