Harold Leon Breeden (3 October 1921 Guthrie, Oklahoma – 11 August 2010 Dallas, Texas), known as Leon Breeden, was a jazz studies educator at the collegiate level, a classical and jazz clarinetist, a saxophonist, a prolific composer and arranger, a music clinician, and jazz festival judge. The Associated Press release of Breeden's death referred to him as, "legendary director of the University of North Texas' jazz program who made its 'One O'Clock Lab Band' internationally famous."