Polarized Raman measurements on single crystals of CuO yield the symmetry assignments of the three predicted Raman active lattice modes : 297 cm⁻¹ (A_g), 344 cm⁻¹ (B_g) and 629 cm⁻¹ (Bg). These results are compared to literature data, including IR spectra. Our measurements confirm at low temperature the appearance of an additional Raman band around 240 cm⁻¹. The temperature dependence of the linewidth of the A_g mode presents an anomalous behavior near the magnetic phase transition, suggesting the possible presence of magnon-phonon couplings in the antiferromagnetic phase.