William Mason Massey IV (born January 24, 1997) is an American professional stock car racing driver.

[3] He was scheduled to run the full NASCAR Craftsman Truck Series in 2023 for Reaume Brothers Racing in the No.

On April 1, 2023, at Texas Motor Speedway in the SpeedyCash.com 250, Massey had his best career Truck Series finish of 11th place.

99 for B. J. McLeod Motorsports for a portion of the 2020 NASCAR Xfinity Series season, with his first race at Las Vegas Motor Speedway.

[6] After the season was over, Massey returned to a track that he raced earlier in his career to win the dirt crate late model feature at Senoia Raceway's Fall Nationals.