The Hummer H1 is a full-size four-wheel-drive utility vehicle based on the M998 Humvee, which was developed by AM General when it was a subsidiary of American Motors Corporation (AMC).

GM stopped marketing the H1 in the 2006 model year, but AM General continued production of the military Humvee versions through 2018.

[4] On March 22, 1983, AM General Corporation was awarded a production contract for 55,000 High Mobility Multipurpose Wheeled Vehicles (HMMWV).

After the Gulf War was over, AM General modified the M998 Humvee military version for the civilian marketplace powered by 6.2 L GM Diesel V8 engine.

General Motors announced that 2006 would be the last model year for the Hummer H1, with civilian market production winding down in June 2006 due to new emission regulations for diesel-engined vehicles that were to take effect in 2007.

Less known variants were a two-door pickup truck and a four-door slantback, which shares the same body style as the Humvee employed by the U.S. military.

The standard 16-inch (406 mm) ground clearance is achieved by positioning driveline components high inside a wide channel in the center of the passenger compartment, meaning that despite the large interior volume, the H1 only had seating for four.

[11] Other features include inboard brakes and portal gears to position drivetrain's half shafts higher for greater ground clearance.

[14] On June 2, 2009, General Motors attempted a sale of its Hummer brand to a Chinese company, Tengzhong, as part of its bankruptcy settlement.

"[15] On February 24, 2010, General Motors announced that the company was shutting down its Hummer brand due to Tengzhong withdrawing its bid.

[16][17] On January 30, 2020, General Motors announced the revival of the Hummer nameplate, which would be used as a new electric off-road vehicle within its GMC brand.