Buick () is a division of the American automobile manufacturer General Motors (GM). Started by automotive pioneer David Dunbar Buick in 1899, it was among the first American marques of automobiles, and was the company that established General Motors in 1908. Before the establishment of General Motors, GM founder William C. Durant had served as Buick's general manager and major investor.

In the North American market, Buick is a premium automobile brand, selling luxury vehicles positioned above GM's mainstream brands, while priced below the flagship luxury Cadillac division. Buick's current target demographic according to The Detroit News is "a successful executive with family."

After securing its market position in the late 1930s, when junior companion brand Marquette and Cadillac junior brand LaSalle were discontinued, Buick was positioned as an upscale luxury car below the Cadillac. During this same time period, many manufacturers were introducing V8 engines in their high-end models, while Buick used a straight-8 for all models starting in 1931. The first Buick V8 was introduced in 1953, then in 1962, the Buick V6 was introduced for the compact Special model. Buick engines, with few exceptions, have always used overhead valves which the company pioneered in the 1904 Buick Model B.

In 2017, Buick sold more than 1.4 million vehicles worldwide, a record for the brand. Buick's largest market is Mainland China, which accounts for 80% of its sales. Buicks are also sold in the United States, Canada, and Mexico. U.S. market share in 2022 was 1.2%, down by nearly half of its market share in 2000.