1915 Indianapolis 500

The 5th International 500-Mile Sweepstakes Race was held at the Indianapolis Motor Speedway on Monday, May 31, 1915. The traditional race date of May 30 fell on a Sunday, but race organizers declined to schedule the race for Sunday. The race was set for Saturday May 29, but heavy rains in the days leading up to the race flooded the grounds and made some roads leading to the track impassible. Officials decided to postpone the race until Monday May 31 in order to allow the grounds to dry out. Speedway management would maintain their policy to not race on Sundays until 1974.

After a loss in 1912, Ralph DePalma succeeded in victory for 1915. DePalma was accompanied by riding mechanic Louis Fountaine.

Starting grid
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Box score
Note: Relief drivers in parentheses

 Former Indianapolis 500 winner

 Indianapolis 500 Rookie

Race details

 * For 1915, riding mechanics were required.
 * When about 2,000 unsuspecting fans showed up on May 29 for the race (which had already been rescheduled to May 31), Ralph DePalma entertained the fans with a tire changing exhibition.