Hummer H3 SUV/Tri/x is a vehicle from General Motors' Hummer division, introduced in 2006. The H3 is the smallest of the three Hummer models, and though the H3 concept car was a pickup truck, the final vehicle is a conventional SUV.

The H3 uses the 3.7 L (3653 cc) Atlas straight-5 engine, the same engine that is used in the Chevrolet Colorado and GMC Canyon pickup trucks. This 20-valve DOHC unit produces 242 hp (180 kW) at 5600 rpm and 242 ft·lbf (327 N·m) at 2800 rpm. It is available with a 5-speed manual or 4-speed automatic transmission that includes GM's Stabilitrak vehicle stability control. Its 111.9 in (2842 mm) wheelbase is 1.1 in (28 mm) shorter than the GMT360 SUVs.

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