Robert Franklin "Butch" Leitzinger (born February 28, 1969[1]) is an American professional racing driver.

81 Porsche GT3 car in the first four events in the American Le Mans Series GTC class for the 2010 season, with Juan Gonzales earning victories at the 2010 12 Hours of Sebring as well as at Long Beach and a podium finish at Laguna Seca, resulting in the duo achieving a healthy lead in the points standings before unfortunate circumstances forced Alex Job Racing to downsize to a single-car effort with the No.

In the Petit Le Mans at Road Atlanta the car was sidelined early with a throttle position sensor problem.

Leitzinger shared the 1999 United States Road Racing Championship (USRRC) championship with teammate Elliott Forbes-Robinson and won the famed Rolex 24 at Daytona: twice with Dyson Racing (1997 & 1999), and once in a Nissan 300ZX (1994) co-driven with Scott Pruett, Steve Millen and Paul Gentilozzi.

At the beginning of their involvement in ALMS, Leitzinger and the Dyson team fielded Ford-powered Riley & Scott cars but switched to the newer MG-Lola EX257 midway through the 2002 season.

Dyson Racing achieved its first ALMS victory in the car when Leitzinger and James Weaver scored an overall win at Infineon Raceway in Sonoma, California.

On June 24, 2007, Leitzinger ran the NASCAR Nextel Cup race at Infineon Raceway in the Bill Davis Racing-owned No.