Raman spectra of CuGa 3 Te 5 that has a chalcopyrite‐related structure with space group P 2 c were obtained at room temperature from measurements performed under parallel ( z | xx | z ) and perpendicular ( z | x y| z ) polarization dependent configurations. A tentative assignment of the observed lines was made by comparison with the reported phonon modes for ZnTe, which is the binary analogue of CuGaTe 2 , and also by using theoretical models reported in the literature for multinary compounds. The main lines observed at 129, 144, and 187 cm −1 were assigned to the three A 1 ‐symmetry modes for P 2 c ternary compounds predicted by group theory, and other lines at 91 and 277–285 cm −1 to the B 1 modes. Also, lines at 55, 64, 102, 172, 224, 265–269, and 333–334 cm −1 and lines at 78, 172, 224, 205–209, 242–249, and 342 cm −1 were assigned to E and B 2 modes, respectively. The higher‐phonon frequencies observed at 291–297, 303–310, and 319–323 cm −1 are attributed to an overtone of the A 1 mode at 144 cm −1 , and a combination of A 1 and E modes, respectively.