The Hummer H2 is an SUV and SUT manufactured by General Motors under the Hummer brand. It is a large truck (lighter and slightly slimmer than the Hummer H1, while slightly longer and slightly taller) with room for six passengers (including driver). The rearmost part of the H2 SUV was modified to a pickup truck bed for the 2005 H2 SUT ("Sport Utility Truck"). Competitors include the Infiniti QX56, Range Rover Sport, Cadillac Escalade, Lincoln Navigator, Mercedes-Benz GL450, and Toyota Land Cruiser.

The H2 is built under contract by AM General at a specially constructed plant in Mishawaka, Indiana, USA. Although it shares GM's GMT820 truck platform with the Chevrolet Tahoe and GMC Yukon, those vehicles differ in many ways and are constructed in three other GM plants. The H2's final frame assembly is made up of 3 sections: The front uses a modified GM 2500-Series utility frame, the mid-section is all new and is completely boxed, and the rear section uses a modified GM 1500-Series frame which is upgraded for the 8,600 pound (3629 kg) gross vehicle weight. The 2008 Hummer H2 does 0-60 in 8.2 seconds.

H2 sales were initially strong, but fell to 28,898 for 2004 and 23,213 for 2005. GM Chairman and CEO Rick Wagoner announced on June 3, 2008, the closing of several truck and SUV plants saying high fuel prices have produced a rapid and permanent change in consumer preferences. Wagoner also said GM is looking at possibly selling its Hummer unit after reviewing the SUV brand that is based on military vehicles. The H2's MPG is not posted with the EPA, but is known to be lower than the H3's 13 miles per gallon. The brand has become the symbol to many members of the public of a gas-guzzling large U.S. vehicle.