The Champion Spark Plug 100 Mile an Hour Club was a group formed to honor drivers who completed the Indianapolis 500 at an average speed of 100 miles per hour or faster. It was formed in 1935, and continued to be recognized through 1969. It was sponsored by Champion Spark Plugs, and was the brainchild of M.C. deWitt, the company's advertising manager. During its heyday, it was considered one of the most prestigious honors in motorsports, and membership was highly sought after by drivers.

The 18th International 500-Mile Sweepstakes Race was held at the Indianapolis Motor Speedway on Friday, May 30, 1930. The race was part of the 1930 AAA Championship Car season.