Derek Sherinian (born August 25, 1966) is an American keyboardist who has toured and recorded for Alice Cooper, Billy Idol, Yngwie Malmsteen, Kiss, Steve Vai, and Joe Bonamassa. He was also a member of Dream Theater from 1994–99, is the founder of Planet X and also one of the founding members of Black Country Communion and Sons of Apollo.

He has released seven solo albums that have featured a variety of prominent guest musicians, including guitarists Slash, Yngwie Malmsteen, Allan Holdsworth, Steve Lukather, Joe Bonamassa, Billy Sheehan, Zakk Wylde and Al Di Meola.

Sherinian has distinguished himself by his aggressive "guitaristic" approach to his keyboard style. In 2018, he was voted #9 Greatest Keyboardist Ever in Prog Magazine. He has also appeared on the cover of numerous keyboard magazines around the world, including the November 2011 issue of Keyboard Magazine, which declared Sherinian a "Keyboard Hero for a new generation". He has also been called the "King of the Keys" by Guitar World magazine and the "Caligula of Keyboards" by Alice Cooper. His musical influences include Elton John, Van Halen and Jeff Beck.

Derek Sherinian was born in Laguna Beach, California. He began taking piano lessons at age five in Santa Cruz, California. After his junior year at Soquel High School, he received a scholarship to the Berklee College of Music in Boston where he was the roommate of future Megadeth guitarist and Trans-Siberian Orchestra musical director Al Pitrelli. He has since studied with other keyboardists, including Mitchel Forman, T Lavitz, Russell Ferrante and Alex Alessandroni.