Hummer is a marque of vehicles sold by General Motors. For the military vehicles of which the trademark is based see HMMWV.

Hummers were traditionally built by AM General Corporation, formerly the heavy industries division of American Motors, in its Mishawaka, Indiana assembly plant. AM General had planned to sell a civilian version of the Hummer as far back as the late 1980s. In 1990, two matching white Hummers were driven from London, UK to Beijing, People's Republic of China over the rough roads of the central Soviet Union. The Hummers made the drive with ease, and highlights of this journey were broadcast on ESPN in the United States. The publicity would pale in comparison to the attention that the HMMWV received for its service in Operation: Desert Storm the following year.

In 1991, AM General began selling a civilian version of the M998 High Mobility Multipurpose Wheeled Vehicle (HMMWV or Hum-Vee) vehicle to the public under the brand name Hummer. In 1999, AM General sold the brand name to General Motors but continued to manufacture the vehicles, which GM then re-sold. In the next few years, GM introduced two new homegrown models, the H2 and H3, and renamed the original vehicle to H1. AM General continues to build the H1 and is contracted by GM to produce the H2. The H3 is built in Shreveport, LA.

As of 2004, Hummer has gone international with importers and distributors opened and elected in Europe and other selected markets. The sucess of Hummer internationally is yet to be known in large sales volumes, but celebrities and business people alike have brought Hummers around the world to cure their curosity. Markets such as Australia have taken interest to hummers with importers converting the latest H3 to right hand drive despite GM not officially selling the brand in Australia

From 2006, GM will be building/assembling the Hummer H3 at the Port Elizabeth plant in South Africa to make Hummers internationally available. Hummers at the Port Elizabeth plant will be built for local South African consumption and exports to Australia, the United Kingdom and Japan.