Robert Charles "Bob" Sweikert was an American racing driver, best known as the winner of the 1955 Indianapolis 500 and the 1955 National Championship, as well as the 1955 Midwest Sprint car championship - the only driver in history to sweep all three during a single racing season.

The 39th International 500-Mile Sweepstakes was held at the Indianapolis Motor Speedway on Monday, May 30, 1955. The event was race 1 of 11 of the 1955 AAA National Championship Trail and was race 3 of 7 in the 1955 World Championship of Drivers.