Demon, Steel roller coaster at Six Flags Great America, Illinois, US

Demon is a steel roller coaster at Six Flags Great America in northern Illinois. The track runs through two vertical loops and a pair of corkscrew inversions across roughly 649 meters (2,130 feet).

The coaster opened in 1976 under a different name and received a major redesign in 1980. That transformation added the current inversions and a darker color treatment.

The ride's 1980 retheme came with a storyline told in its soundtrack: the park missed three payments on the coaster, so a demon repossessed it. The original sign showed red eyes staring from a boarded-up pipe above a pool of red-dyed water. Religious opposition later led to the removal of most of these elements.

Each train has six cars with two rows, seating 28 riders. The ride's inversions are two vertical loops, the first 21.3 metres tall and the second 16.8 metres, followed by a double corkscrew 10.7 metres high. A green chain-link fence with a red and white "DANGER" sign stands in front of the track.

Before climbing, trains pass through a lit tunnel with red lamps. The first drop after the hill then descends at roughly 54 degrees.