Justin Allgaier (born June 6, 1986) is an American professional stock car racing driver. He currently competes full-time in the NASCAR Xfinity Series, driving the No. 7 Chevrolet Camaro for JR Motorsports. He was the 2008 ARCA RE/MAX Series Champion and the 2009 Nationwide Series Rookie of the Year.
Allgaier was born in Riverton, Illinois, and began his racing career at the age of five in quarter midgets, winning over one hundred races and five championships. He began stock car racing at thirteen in the UMP Late Model Series, where he competed for three seasons. At the age of sixteen, he made his debut in the ARCA RE/MAX Series at the Illinois State Fairgrounds Racetrack, driving the #99 Hoosier Tire Midwest/Law Automotive Chevrolet for Ken Schrader; he qualified twenty-ninth and finished seventeenth.
He ran two additional races for Kerry Scherer and Bob Schacht, with a best finish of eleventh.
Gibson has stepped out of the driver seat to concentrate on developing new talent. He, along with Briggs Cunningham and Kerry Scherer started Cunningham Motor Sports in 1997. That team raced ARCA and NASCAR Craftsman Trucks for three years. Scherer moved the team to Charlotte in 2000, but he eventually returned to Georgia and worked with Gibson in the Mark Gibson Racing (MGR) shop from 2007 until 2010.
Gibson became a partner, owner and General Manager of car #77. In 2009, that team would win nine races and their driver Parker Kligerman would win the ARCA Rookie Of The Year.