A list of events that occurred on March 12 related to Six Flags.

• 1968 – Aaron Eckhart is born.
• 1979 – Angus G. Wynne dies.
• 2006 – Ten people riding the Texas Tornado at Six Flags Over Texas suffer minor injuries when the ride is brought to an abrupt stop and several swing seats collide with each other.  Five people were sent to the hospital after complaints of back pain, and the others were treated at the on-site first aid station.
• 2018 – Six Flags announces Pirates of the Deep Sea for Six Flags Fiesta Texas.