The Audi 100 and Audi 200 are executive cars manufactured for model years 1968–1994 by Audi, a division of the Volkswagen Group. The C3 model of the Audi 100 was sold in the United States as the Audi 5000 until 1988.

Audi released the C4 (a heavily revised C3) in 1991. The C3-platform Audi V8 continued to be sold as a separate line. The major change for the C4 was the introduction of a 2.8 L, 90-degree, SOHC 12v, V6 engine. It was later joined by a 2.6 L variant, of the same configuration as the 2.8 L unit. They are essentially the same engines offered in the 1992, B4 Audi 80. The option of quattro permanent four-wheel drive was an option across the range, and the Audi 100 quattro was available with a ZF four-speed automatic gearbox.

For the 1995 model year, in conjunction with some styling revisions, Audi dropped the Audi 100 tag, renaming it the A6 instead. In addition, the existing 100-derived Audi S4 became the S6. The S4 name was later re-used for the high-performance derivative of the Audi A4. The Audi V8 had been replaced by the A8 in 1994.

The C4-based A6 continued until early 1997, when it was replaced by an all-new A6.