The Cadillac CTS is a luxury car, manufactured and marketed by General Motors from 2003 until 2019 across three generations. 

Initially available as a 4-door sedan using the GM Sigma platform, GM offered the second generation CTS in 4-door sedan, 2-door coupe, and 5-door sport wagon, and the third generation as a sedan, using a stretched version of the GM Alpha platform. High performance sedan variants were offered for each generation, as the CTS-V—with wagon and coupe variants offered for the second generation.

In a 2003 report titled The 90 days that shaped Cadillac, Automotive Newsnoted that the first generation CTS marked a $4B investment by General Motors to set a new course for Cadillac styling, introduce a new rear-drive platform, and importantly, re-establish the brand's relevancy.