Spencer Gallagher (born November 20, 1989) is an American professional driver. He currently competes full-time in the NASCAR Xfinity Series, driving the No. 23 Chevrolet Camaro for GMS Racing, and part-time in the Camping World Truck Series, driving the No. 23 Chevrolet Silverado for GMS Racing. He is also the son of Allegiant Air's CEO, Maurice J. Gallagher, Jr.

Gallagher was born in Las Vegas, Nevada. According to Gallagher, he and fellow driver Dylan Kwasniewski lived in the same neighborhood growing up, though their first encounter was on the racetrack. He is the son of Allegiant Air CEO Maury Gallagher. Gallagher spent time working for a Silicon Valley software company at age 19 while transitioning to a full-time racing career.

Gallagher began racing at age 12 in the Bandolero Bandit Series, then progressing to the Legends Car Series at the Las Vegas Motor Speedway Bullring. Gallagher began to take his racing prospects seriously in 2009 on the recommendation of car owner and former driver T.J. Clark. He won the Silver State Road Racing Championship that year, and the INEX Legends Road Course World Finals in 2010. He also ran 6 races in the Super Late Model Series with a best finish of fourth. In 2011, Gallagher made 6 starts in the NASCAR K&N Pro Series West, then made 2 in the East Series in both 2011 and 2012.

Gallagher made his debut in the ARCA Racing Series at Indianapolis Raceway Park in 2011, and ran two more races with a best finish of 15th in the No. 05 Allegiant Air Chevrolet. He ran the full 19-race schedule in 2012, earning 6 top 10's and finishing 7th in points. His results improved in 2013, with 12 laps led, 5 top 5's and 8 top 10's. He failed to qualify for two races, however, and missed a race after a concussion at Michigan, relegating him to a 10th-place points finish. Gallagher also attempted 5 races (2 DNQ's) in the Camping World Truck Series, with a best finish of 20th at Texas.

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