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The effect of pressure on the vibrational properties of bulk and nanocrystalline powders of cubic bixbyite-type In 2 O 3 has been investigated at room temperature by means of Raman spectroscopy up to 31.6 and 30 GPa, respectively. We have been able to follow the pressure dependence of up to sixteen and seven Raman modes in bulk and nanocrystalline cubic In 2 O 3, respectively. The experimental frequencies and pressure coefficients of the Raman-active modes of bulk cubic In 2 O 3 at ambient pressure are in good agreement with those predicted by our theoretical ab initio calculations. Furthermore, a comparison of our experimental data with our calculations for the Raman modes in rhombohedral corundum and orthorhombic Rh 2 O 3-II structures and with already reported Raman modes of rhombohedral corundum-type In 2 O 3 at room pressure indicate that Raman scattering measurements provide no …