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The Cadillac STS is the successor to the Cadillac Seville. That car used the STS name, standing for "Seville Touring Sedan" on upscale performance-oriented versions from at least 1988. In 1992, Cadillac split the Seville line into STS and less performance-oriented SLS (for "Seville Luxury Sedan") trim lines.

The next year, the STS got Cadillac's then-new Northstar System, including the aluminium DOHC L37 "Northstar" V8 engine. Throughout its existence, the STS was Cadillac's highest-priced sedan model.



Worldwide, the STS is Cadillac's flagship model. In North America, the STS is positioned between the mid-size CTS and larger DTS, and is priced above the DTS.