Dayton Speedway was a race track in Dayton, Ohio, United States.
It has been called the "Fastest 1/2 mile (plus 210 feet) in the world".
The track held events for NASCAR, AAA, MARC, ARCA, ASA, and USAC.
The track was opened in June 1934 as a flat "D shaped" 5/8 mile dirt track.
The original track was a "copy" of the Legion Ascot Speedway.