Kaleidoscope is the fourth studio album by Dutch trance artist Tiësto, released on 6 October 2009 on Musical Freedom, Tiësto's new label in association with PIAS Recordings. It's the first album after Tiësto changed direction and started to move away from trance. There's still some trance on this album, but also house and electro. The album contains collaborations with Nelly Furtado, Emily Haines of Metric, Tegan and Sara, Jónsi of Sigur Rós, Kele Okereke of Bloc Party, and Calvin Harris among others.

The album also features the song "I Will Be Here" with Australian dance act Sneaky Sound System, which was released as the lead single on July 28, 2009. The album entered the Dutch album charts at number 2. It also debuted at number 20 on the UK album charts and at number 5 on the lrish and Mexican album charts.

Tiësto's songs "Louder Than Boom" and "Knock You Out", are featured in Tap Tap Revenge 3 for the iPhone/iPod Touch.
"Escape Me" and "Feel It in My Bones" were used in an episode of The Vampire Diaries