The 1966 12 Hours of Sebring was an endurance race held at the 5.2 mile (8.3 km) Sebring International Raceway, in Sebring, Florida, United States on March 26, 1966. It was the sixteenth running of the endurance classic and the second round of the 1966 World Sportscar Championship season. The race proved to be a disastrous event; one of the darkest in American motorsports history.[1][2][3]