This is a summary of notable incidents that have taken place at amusement parks, water parks, or theme parks currently owned or managed by Six Flags. This list is not intended to be a comprehensive list of every such event, but only those that have a significant impact on the parks or park operations, or are otherwise significantly newsworthy. In some cases, incidents occurred while the park was under different management or ownership. The term incidents refers to major accidents, injuries, or deaths that occur at a park. While these incidents were required to be reported to regulatory authorities due to where they occurred, they usually fall into one of the following categories:

1. The result of a guest's known or unknown health issues.
2. Negligence on the part of the park, either by ride operator or maintenance safety instructions, or deliberate intent to violate park rules.
3. Act of God or a generic accident (e.g., lightning strike, slipping and falling), that is not a direct result of an action on anybody's part.