Bill Mackey (December 15, 1927 – July 29, 1951) was an American racecar driver.

His name at birth was William Christopher Gretsinger, Jr. Mackey was killed while attempting to qualify for an AAA sprint car race at Funk's Speedway in Winchester, Indiana on July 29, 1951, a day which became known as "Black Sunday".

The Indianapolis 500 was part of the FIA World Championshipfrom 1950 through 1960.

Drivers competing at Indy during those years were credited with World Championship points and participation.

This biographical article related to United States auto racing is a stub.