Kellyville is a town in Creek County, Oklahoma, United States. The population was 1,150 at the 2010 census, compared to 906 at the 2000 census.
Kellyville was named for James E. Kelly, who established a local trading post in 1892 and opened a post office on November 27, 1893. St. Louis and Oklahoma City Railroad (later merged into the St. Louis and San Francisco Railway) built a line through Kellyville in 1898.
Oklahoma's worst train disaster took place just west of Kellyville on September 28, 1917, when two Frisco trains collided. Twenty-three people were killed and eighty injured. It remains one of the country's bloodiest train wrecks due to the large number of cattle deaths. In the early 1970s, there were plans to build a ski resort in Kellyville — Oklahoma's first — using artificial snow, but the idea was short-lived due to the region's climate.
Oil and gas were discovered nearby in 1915. This created a population boom and attracted construction of a refinery in Kellyville.