The phonon properties of CoSb 2 have been investigated by Raman scattering spectroscopy and lattice dynamics calculations. Sixteen out of eighteen Raman active modes predicted by factor-group analysis are experimentally observed and assigned. The calculated and measured phonon energies at the point are in very good agreement. The temperature dependence of the A g symmetry modes is well represented by phonon-phonon interactions without contribution from any other phonon or electron related interactions.