A Devil's wheel, Teufelsrad, Human Roulette Wheel or Joy Wheel^[1] is an amusement ride at public festivals and fairs. Devil's wheels have been used at Oktoberfest celebrations since at least 1910.^[2]

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A Devil's wheel is a rotating circular platform upon which riders sit or lie. It begins by spinning slowly and increases its speed to make riders slide off the platform. Spectators stand around the platform, and the announcers often offer some satirical commentary.

Riders who slide off the platform usually hit a cushioned wall. Injuries are possible if riders collide with spectators or other objects. An operator controls the speed of the platform, sometimes slowing it down to give participants the opportunity to re-position themselves toward the center.

An added feature was the mild jolt of electricity transmitted through the metal screws holding the platform down. Riders had to contend with small electrical shocks while trying to hold on to the flat spinning surface.

The platform is a disc. It is not an inertial system because of its rotation. The riders' sense of balance is compromised by the rotating disk. This complicates movement towards or away from the center of the wheel. If one is moving radially outward, in addition to the expected centrifugal force (directed outward), the Coriolis force applies directed tangentially (i.e. laterally).

A smaller version of the Devil's Wheel was displayed at EXPERIMINTA Science Center FrankfurtRheinMain in December 2011.^[3] Devil's wheels is still a part of the Munich Oktoberfest and in the Taunus Wunderland.^[4]

Elements may be added to the Devil's Wheel to make it even more difficult for the riders to hold on. A ball attached to a chain may swing at them or the ride may shake.

In Evelyn Waugh's first published novel, Decline and Fall, the character Otto Silenus describes a Devil's Wheel (referred to as the "big wheel at Luna Park") as a metaphor for life.