The adsorption of acetone on ice under ultrahigh vacuum (UHV) was investigated with temperature-programmed desorption (TPD) mass spectrometry and Fourier transform infrared reflection absorption spectroscopy (FTIRAS). Two types of film, amorphous and crystalline, were investigated. On the amorphous films, two acetone desorption states were observed; one derived from a hydrogen-bonded state and a second that was attributed to the desorption of physisorbed acetone. Only the physisorbed state was observed during desorption from crystalline ice films. Infrared spectroscopy confirmed these assignments. This work provides additional evidence that the surface properties of amorphous ice are different from those of crystalline ice.