Delta was a General Motors compact front-wheel drive automobile and crossover SUV platform, originally developed by Opel Group. Delta was a successor to the Opel T platform; it also replaced J platform and the Z platform used by the Saturn S-Series. The platform debuted in the 2003 Saturn Ion. Vehicles of this platform generally carry the letter "A" in the fourth character of their VINs.

General Motors reused the T-body designation, beginning in 1979 with the front-wheel drive Opel Kadett D and the Vauxhall Astra Mk I. This was part of a global strategy by GM to introduce a new front-wheel drive architecture for its sub-compact models, and would be further developed into the J-body platform which would cover the compact size segment.