Transparent ceramics of the formula (Nd0.01LaxY0.99−x)2O3 (x = 0, 0.05, 0.10) were made with nanopowders and sintered in H2 atmosphere. The Raman spectra of Ln2O3 (Ln = Y, La, Nd) powders and (Nd0.01LaxY0.99−x)2O3 ceramics were investigated. The results show that both La2O3 and Nd2O3 powders are of hexagonal structure, and all (Nd0.01LaxY0.99−x)2O3 ceramics exhibit the same cubic Y2O3 crystal structure. Their lattice parameters were refined by the Rietveld method. The full-widths at half-maximum of Raman peaks increase with the increase in La2O3 content in transparent (Nd0.01Y0.99)2O3 ceramics, while their intensities decrease. At the same time, All Raman peaks shift to lower wavenumbers, and the phonon energy is slightly reduced. Copyright © 2010 John Wiley & Sons, Ltd.