Ryan Shane Sieg (born June 20, 1987) is an American professional stock car racing driver and team owner. He competes full-time in the NASCAR Xfinity Series, driving the Nos. 39/93 Chevrolet Camaro for RSS Racing. He is the younger brother of former driver Shane Sieg.
Sieg made his NASCAR debut in 2009, competing in the Camping World Truck Series Kroger 250 at Martinsville Speedway. Driving the No. 21 Dodge for GunBroker Racing, Sieg started 16th but finished 34th due to an ignition problem. At The Milwaukee Mile, he would start a partial schedule for his family-owned race team. In nine races, Ryan recorded six top-20 finishes including a finish of 9th at Gateway International Raceway.