Experiments on plasma heating with waves in the ion cyclotron range of frequencies that have been performed on the DIII-D tokamak are reviewed. High-power experiments (Prf [greater than or approximately equal to] 1 MW) have been performed using the ion Bernstein wave (IBW) (1988-1990), 32-MHz fast waves (FWs) (1990-1991), 60-MHz FWs (1991-1999), and higher-frequency FWs up to 120 MHz (1994-present). Efficient electron heating of the core plasma has been obtained in all of these regimes, with the exception of the IBW experiments.