Billy Joe Hagan (born March 22, 1932 in Lillie, Louisiana) is a former NASCAR driver/owner. He made three starts in NASCAR's Grand National/Winston Cup division, finishing eighth in his first start, the inaugural Talladega 500 in a self-owned 1968 Mercury. He didn't field another car until 1975, finishing 19th once again at Talladega. He also fielded a car for five races for Skip Manning.
In 1976, he fielded the #92 Stratagraph Chevrolet for Manning, and he won Rookie of the Year honors. Manning was released in 1978, and replaced by Terry Labonte. Labonte won the Southern 500, and won the championship together in 1984. Labonte left the team in 1986, and was replaced by Sterling Marlin. Labonte returned to the team in 1991, but was unable to continue their success. 1994, marked Hagan's last season as a single car owner, fielding cars for John Andretti and Randy MacDonald. In 1996, his shop was purchased by Triad Motorsports. Hagan continued to serve as a co-owner of the operation until the team's demise in 1999.