A list of events that occurred on June 17 related to Six Flags.
- 1987 – A 19-year-old woman is killed after falling from the Lightnin' Loops shuttle loop roller coaster at Six Flags Great Adventure. An investigation by the State Labor Department concluded that the ride itself was operating properly, but that the ride operator started the ride without checking that all of the passengers were securely fastened by the safety harnesses. The Department's Office of Safety Compliance further concluded that the accident would not have occurred if proper procedures had been followed. The park was found to be in violation of the Carnival/Amusement Ride Safety Act and was subsequently charged with the maximum state fines of $1,000.
- 2017 – Justice League: Battle for Metropolis opens at Six Flags Great Adventure.