Diamondback is a steel roller coaster located at Kings Island in Mason, Ohio, United States.

Manufactured by Bolliger & Mabillard (B&M), the ride opened in 2009 as the first hypercoaster to feature a splashdown effect and the first B&M roller coaster at Kings Island.

Diamondback was the biggest investment in Kings Island’s history at the time, costing $22 million to build, but that figure was surpassed in 2014 by Banshee.

[3] Swan Lake was drained and filled with concrete before opening day in 2008; this would become the location of Diamondback's splashdown element.

[12][13] After the train leaves the station, it begins its ascent up the 230 foot (70 m) chain lift hill.

The ride then ascends a 131 foot (40 m) camelback hill and drops, curving left into the hammerhead turn.

After the fourth hill, the train turns down into a 287° counter-clockwise helix, containing the on-ride photo camera, and into the mid-course brake run.

After the short brake run the train drops down into the ravine, raising into a pair of bunny hop hills before entering the final clockwise helix of 323°.

[17] Diamondback won the award for "Best New Attraction in 2009" from the National Amusement Park Historical Association.

[18] Also the roller coaster was ranked second in the Amusement Today's Golden Ticket Awards for best new ride of 2009.