A list of events that occurred on June 12 related to Six Flags.
- 1996 – Runaway Mountain opens at Six Flags Over Texas.
- 2006 – El Toro opens at Six Flags Great Adventure.
- 2007 – A 14-year-old girl boarding Poltergeist at Six Flags Fiesta Texas is paralyzed after falling into a gap between the roller coaster's cars, landing on a concrete floor about 10 feet below the station platform. Family members stated that she may have fainted due to the heat of the day.