The Saturn L-Series was a line of automobiles sold by General Motors' Saturn marque. The L-Series mid-size sedans and station wagons were introduced in 2000. They were based on the Opel Vectra B and manufactured at a GM plant in Wilmington, Delaware. The L-Series was available with straight-4 and V6 engines with either 5-speed manual or 4-speed automatic transmissions.

Poor sales of the L-Series caused GM to cancel the line for 2005. The first L-series car was built in May 1999, and the last one rolled off the Wilmington line on June 17, 2004, after a short run of 2005 models. About 406,300 L-series cars were built in this period. The plant was then retooled to build the Pontiac Solstice and Saturn Sky roadsters. The replacement for the L-Series, the Saturn Aura, arrived in August 2006 for the 2007 model year. The Aura was built on the Epsilon platform, also shared by the Pontiac G6 and the Opel Vectra C.