Karl Denson is an American funk and jazz saxophonist, flutist and vocalist from Santa Ana, California. He was a member of Lenny Kravitz's band and has co-founded and led The Greyboy Allstars. Denson has recorded with artists including Jack DeJohnette, Dave Holland, Slightly Stoopid, Blind Boys of Alabama, Blackalicious, Stanton Moore, and Jon Foreman of the rock band Switchfoot. He continues to lead his own Karl Denson's Tiny Universe and Karl Denson Trio.
Members of KDTU include Denson, Chris Stillwell, Chris Littlefield, Brian Jordan, David Veith and John Staten.
Guitar player D. J. Williams joined in summer 2011.
KD3 comprises Denson with keyboardist Anthony Smith and drummer Brett Sanders.