The 1989 Champion Spark Plug 400 was the 19th stock car race of the 1989 NASCAR Winston Cup Series season and the 20th iteration of the event.

The race was held on Sunday, August 20, 1989, before an audience of 80,000 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).

Geoff Bodine, driving for Hendrick Motorsports, would win the pole, setting a time of 40.968 and an average speed of 175.962 miles per hour (283.183 km/h) in the first round.