Spencer Pumpelly (born December 28, 1974) is an American professional racing driver who competes part-time in IMSA, driving the No. 44 Acura NSX GT3 for Magnus Racing with Archangel Motorsports. A veteran sports car racing driver, he has competed in IMSA and its predecessor series, the Rolex Sports Car Series and the American Le Mans Series since 1998 and 1999, respectively. He also has competed in the Continental Tire Sports Car Challenge and the ARCA Menards Series in the past.