The 1991 Champion Spark Plug 500 was the 13th stock car race of the 1991 NASCAR Winston Cup Series season and the tenth iteration of the event.

The race was held on Sunday, June 16, 1991, in Long Pond, Pennsylvania, at Pocono Raceway, a 2.5 miles (4.0 km) triangular permanent course.

In the final laps of the race, owner-driver Darrell Waltrip would mount a late-race charge for the lead, passing with 18 laps to go in the race to take his 81st career NASCAR Winston Cup Series victory and his second and final victory of the season.

The race was held at Pocono International Raceway, which is a three-turn superspeedway located in Long Pond, Pennsylvania.

Mark Martin, driving for Roush Racing, would win the pole, setting a time of 55.557 and an average speed of 161.996 miles per hour (260.707 km/h) in the first round.