In 1992, 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", called the Hummer H1.

In 1998, AM General sold the brand name to General Motors, but continued to manufacture the vehicles. GM is responsible for the marketing and distribution of all Hummers produced by AM General. In the next few years, GM introduced two new homegrown models, the H2 and H3, and renamed the original vehicle H1. AM General continued to build the H1 until it was discontinued in 2006, and is contracted by GM to produce the H2. The H3 is built in Shreveport, LA alongside the Chevrolet Colorado and GMC Canyon pickups, with which it shares the GMT-355 platform (custom modified and designated GMT-345).

As of 2006, Hummer has gone international with selected importers and distributors in Europe and other markets.

Since October 10, 2006, GM has been producing the Hummer H3 at its Port Elizabeth plant in South Africa for international markets. Hummers at the Port Elizabeth plant are built both for local South African consumption and exported to Australia in the 2008 model year. In Europe, the Middle East, and Japan, the H3 is also already available. As of October 2006, Hummer vehicles are marketed by about 300 dealers in 34 countries. 173 of those are in the U.S.

The H2 is also assembled in Kaliningrad, Russia, by Avtotor, starting in June 2004. The plant produces a few hundred vehicles annually, and its output is limited to local consumption (five dealers in Russia initially).

GM CEO Rick Wagoner has said the Hummer brand of trucks will run on Biofuel Powertrains at last year's[clarification needed] Los Angeles International Auto Show.

The new 2008 model of the H2 boasted all new interior and a new more powerful engine.

The future of the Hummer brand is in doubt. On Tuesday 3 June 2008, one day prior to GM's annual shareholder meeting, CEO Rick Wagoner said the brand is being reviewed, and has the possibility of either being sold, having the production line completely redesigned, or being discontinued. This is due to the decreasing demand for large SUVs as a result of higher oil prices. Almost immediately after the announcement, a pair of Indian automakers, one of them Mahindra & Mahindra, have expressed interest in purchasing all or part of Hummer.