Mayhem Festival 2015 was the eighth annual Mayhem Festival. It was confirmed that Slayer, King Diamond, Hellyeah and The Devil Wears Prada will be headlining the festival, while Whitechapel, Thy Art Is Murder, Jungle Rot and Sister Sin would be among those supporting. Dates were announced on April 13, 2015. It was the final Mayhem festival until the return was announced as a one-day festival in October 2024
ðJuly 22, New Hampshire's show was cancelled and was replaced with Erie, Pennsylvania.