A list of events that occurred on May 14 related to Six Flags.

• 2009 – Soft opening of Monster Mansion at Six Flags Over Georgia.
• 2011 – SkyScreamer opens at Six Flags St. Louis.
• 2015 – Soft opening of El Diablo at Six Flags Great Adventure.
• 2016 – Fireball opens at Six Flags Fiesta Texas.
• 2021 – Harley Quinn Spinsanity opens at Six Flags America.
• 2022 - Pirates of Speelunker Cave opens at Six Flags Over Texas.