A list of events that occurred on May 26 related to Six Flags.

• 1999 – Batman: The Ride opens at Six Flags Over Texas.
• 2002 – A 58-year-old park employee working in the roller coaster's restricted area is killed by Batman: The Ride at Six Flags Over Georgia after being struck in the head by the dangling leg of a 14-year-old girl riding in the front. The girl was hospitalized with a leg injury.
• 2017 – Spinsanity opens at Six Flags St. Louis.
• 2018 – Mardi Gras Hangover opens at Six Flags Great America.
• 2022 – DC Universe opens at Six Flags Great America.