The S-series is a family of compact cars from the Saturn automobile company. This was the first series of Saturn vehicles. The automobile platform used, Z-Body, was developed entirely in-house at Saturn and shared very little with the rest of the General Motors product line.

The original S series was marketed from the fall of 1990 through the end of the 2002 model year, with a redesign in 1996.

The S-series line-up included sedans (SL, SL1, SL2), coupes (SC, SC1, SC2) and wagons (SW1, SW2). In the late 1990s right hand-drive versions were exported to Japan. Two engines, unique to Saturn, were available. They were the SOHC and DOHC fours, each 1.9 liters in displacement. The 1996 redesign of the SC models gave them a "third door", a small rearward-opening door behind the driver's door to allow rear passengers easier entry and exit.

The S-series was replaced with the Saturn ION in 2003.