Justin Allgaier (born June 6, 1986) is an American professional 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 NASCAR 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 No. 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.

Allgaier ran additional ARCA races in 2003, making six starts in the No. 86 owned by his father. He had a sixth-place finish in his second start at Toledo Speedway, and later a best finish of third at Salem Speedway. The next season, he made only five starts but had a second-place at Toledo. In addition, he was a representative of the United States in the South Pacific Saloon Car Championship, where had two top-fives. In 2005, Allgaier ran seven races in ARCA, splitting time between cars owned by Wayne Hixson and Bobby Gerhart. He won his first career pole at Springfield, setting a new track record, and had four top-five finishes. He also made his NASCAR debut in the Craftsman Truck Series, making four starts in the No. 63 MB Motorsports/Dave Porter Ford. He failed to make five races and did not finish higher than 26th. That year, he appeared on the Discovery Channel program, Driver X: The Race For The Ride. The show's premise was Jack Roush searching for new talent to drive Roush Racing-prepared vehicles in NASCAR's top 3 series.

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