The 2004 Pennsylvania 500 was the 20th stock car race of the 2004 NASCAR Nextel Cup Series season and the 32nd iteration of the event. The race was held on Sunday, August 1, 2004, before a crowd of 90,000 in Long Pond, Pennsylvania, at Pocono Raceway, a 2.5 miles (4.0 km) triangular permanent course. The race took the scheduled 200 laps to complete. At race's end, Jimmie Johnson of Hendrick Motorsports would hold off the field on the final restart with five to go to win his 10th career NASCAR Nextel Cup Series win and his fourth win of the season, sweeping both Pocono races in 2004. To fill out the podium, Mark Martin of Roush Racing and Kasey Kahne of Evernham Motorsports would finish second and third, respectively.

A. J. Henriksen is an American professional stock car racing driver. He has previously competed in the ARCA Racing Series from 1995 to 2017.