Theta is General Motors' automobile platform for compact/mid-size crossover SUVs.

The architecture debuted in 2002 with the Saturn Vue and was later used for the Chevrolet Equinox and Captiva and similar models.

Engine choices include the Family II straight-4, Ecotec straight-4, 3400 V6, and even a Honda V6, the L66.

The Chevrolet Equinox and Pontiac Torrent use a stretched 112.5 in (2857 mm) wheelbase, but share much with the Saturn.

The Saturn Vue was one of the first of General Motors' vehicles to be offered with a hybrid powertrain, GM's belt alternator starter (BAS) system, in 2006.