Herbert Grant Adcox (January 2, 1950 – November 19, 1989) was an American stockcar driver who died in a single-car accident in the 1989 Atlanta Journal 500 in the NASCAR Winston Cup Series.

With a hundred laps in the books, a caution period came out as Donnie Allison's clutch burned out and David Sisco's motor blew up.

He qualified for the 1975 Talladega 500, but his crew chief Gene Lovell suffered a heart attack and died in their garage.

His spot on the grid was given to Tiny Lund, who had not raced in Winston Cup for several years.

A year later, he was again sponsorless; he timed in fourth for the 1979 Firecracker 400 at Daytona International Speedway, but his car's raw speed did not pay off, and his motor expired early.

Adcox's primary claim to fame was for being a strong competitor in ARCA competition, a lesser stockcar series that uses older Winston Cup cars and more grassroots-based operations.

Dale Earnhardt, in an interview before a 1989 race at North Carolina Motor Speedway, remarked about how well Adcox had done in ARCA and said that if he had the monetary backing that other teams had, he might become a success in NASCAR.