The Mercedes-Benz W140 for sale online is a series of flagship vehicles manufactured by Mercedes-Benz from 1991 to 1998 in sedan/saloon and coupe body styles and two wheelbase lengths (SE and SEL). Mercedes-Benz unveiled the W140 S-Class at Geneva Motor Show in March 1991 with sales launch in April 1991 and North American launch on 6 August 1991.

All models were renamed in June 1993 as part of the corporate-wide nomenclature changes for 1994 model year on, becoming S regardless of wheelbase length or body style as well as fuel type. Diesel models carried a TURBODIESEL trunk/boot lid label. In 1996, the S-Class coupé was renamed again as CL-Class into its own model range.

The Mercedes-Benz W140 for sale online was superseded by the W220 S-Class sedan and C215 CL-Class coupé in 1998 after an eight-year production run. Production of the W140 reached 432,732,^[3] with 406,710 sedans and 26,022 coupés.