The 1991 Miller Genuine Draft 400 was the 14th stock car race of the 1991 NASCAR Winston Cup Series season and the 23rd iteration of the event.

The race was held on Sunday, June 23, 1991, before an audience of 90,000 in Brooklyn, Michigan, at Michigan International Speedway, a two-mile (3.2 km) moderate-banked D-shaped speedway.

It is known as a "sister track" to Texas World Speedway as MIS's oval design was a direct basis of TWS, with moderate modifications to the banking in the corners, and was used as the basis of Auto Club Speedway.

Michigan International Speedway is recognized as one of motorsports' premier facilities because of its wide racing surface and high banking (by open-wheel standards; the 18-degree banking is modest by stock car standards).

Michael Waltrip, driving for Bahari Racing, would win the pole, setting a time of 41.296 and an average speed of 174.351 miles per hour (280.591 km/h) in the first round.