Frontier City, Amusement park in Oklahoma City, United States.

Frontier City is an amusement park in Oklahoma City covering a large site with roller coasters, water rides, and carnival attractions set in a Western town from the 1800s. The grounds feature wooden storefronts, saloons, and rustic buildings designed to evoke a frontier settlement.

The park opened in 1958 to represent the territorial expansion period in Oklahoma. Since its founding, operators have added new rides and themed sections while keeping the Western concept.

Frontier City grew out of the Boomtown exhibit of the 1957 Oklahoma Semi-Centennial Exposition, and its opening ceremony still uses a six-shooter fired at a rope across the stockade entrance instead of a ribbon. In its early seasons the park was known for staged gunfights, Indian dancing, saloon shows and train robberies; admission was free and visitors paid a quarter for the gunfight shows.

Frontier City sits along Interstate 35, the former Route 66 corridor, in northeast Oklahoma City. The park closed temporarily in 2020 during the COVID-19 pandemic and reopened in June as the first Six Flags park to do so. Its layout follows four square blocks of streets, so walking between the Western storefronts and the rides takes little time.

Frontier City opened in 1958 with a ceremony in which a six-shooter fired at a rope stretched across the stockade entrance instead of a ribbon cutting, and the park still opens the same way. Its first buildings and props came from the Boom Town exhibit of the 1957 Oklahoma Semi-Centennial Exposition.