The aim of this study was to investigate the effects of novel treatment techniques (ozone and ultrasound) on the dyeability of Angora rabbit fiber. For this purpose, the effects of the ozonation time and fiber moisture during ozonation on the dyeing properties of Angora rabbit fiber were researched. Also, dyeing was performed conventionally and with the use of ultrasound techniques after ozonation; these were compared in terms of the color yields. Consequently, it was found that the ozonation process and dyeing with power ultrasound improved the dyeability of Angora rabbit fiber significantly. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci 120: 3119-3125, 2011