The 1999 Dura Lube/Kmart 300 was the 26th stock car race of the 1999 NASCAR Winston Cup Series season and the third iteration of the event. The race was held on Sunday, September 19, 1999, in Loudon, New Hampshire, at New Hampshire International Speedway, a 1.058-mile (1.703 km) permanent, oval-shaped, low-banked racetrack. The race took the scheduled 300 laps to complete. Within the final laps of the race, Team SABCO driver Joe Nemechek would manage to fend off eventual second-place finisher, Joe Gibbs Racing driver Tony Stewart when a caution with three to go would come to end the race under caution. The win was Nemechek's first career NASCAR Winston Cup Series victory and his only win of the season. To fill out the podium, Joe Gibbs Racing driver Bobby Labonte would finish third.