Ken Butler III (born May 2, 1982) is an American professional driver. He is the older brother of Brett Butler and the son of Aaron's president Ken Butler. Butler III has driven in the NASCAR Nationwide Series, Camping World Truck Series, ARCA Racing Series, and the Pro Cup Series.

Butler's interest in racing started when his father took younger brother Brett and Ken to a go-kart race when Ken was eighteen. He took classes at the Richard Petty Driving Experience and Buddy Baker's Speed Tech. Five years later, Butler ran his first season in the Pro Cup Series, recording a best finish of twelfth at Bristol Motor Speedway and finishing seventeenth in points. He ran the following season, 2006, and recorded his first top ten and top five. He also failed to qualify for two races that season. He ran a race at South Boston Speedway in 2007 while focusing on the ARCA Racing Series and NASCAR Camping World Truck Series.

Butler ran a limited schedule in the 2007 ARCA Re/Max Series with Eddie Sharp Racing as part of its driver development program. He scored his first career victory in only his fourth start, holding off Ken Schrader at Toledo Speedway. However, a damper was put on Bulter's win as he bumped Michael McDowell out of the way in what some, including Schrader, called an unfair move. Continuing to run as part of ESR and Michael Waltrip Racing's development program, he ran along teammates Justin Lofton and Scott Speed. Butler was not victorious at all that year, the only one of three cars on the team to do so. Despite that, he moved up to the NASCAR Nationwide Series for 2009. That year, Butler ran a limited schedule for Andy Belmont but struggled.

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