Paul "Paulie" Hartwig III (born 2010 or 2011) is an American professional stock car racing driver who competes full-time in the SMART Modified Tour, driving the No. 73 for his father, Paul Hartwig Jr., who has previously competed in racing, including in the now defunct NASCAR Whelen Southern Modified Tour.
Hartwig III originally made his debut in the SMART Modified Tour in 2022, but did not return until 2025 due to age restrictions. On April 12, 2025, Hartwig III become the youngest winner in series history when he won at Hickory Motor Speedway at the age of fourteen.
Hartwig III has also competed in series such as the Carolina Crate Modified Series, the Race of Champions Asphalt Modified Tour, the Indoor Auto Racing Championship, and the Short Track Super Series.