Surface photovoltage spectroscopy has been carried out on real n- and p-type (110) CdTe surfaces in the wavelength range 0.36-1 μm at room temperature (300 K), and at atmospheric pressure. The measurements show the existence of surface states at 1.3; 1.48, and 1.2; 1.46 eV within the energy gap of n- and p-type CdTe, respectively. Surface states greater than the energy gap at 2.24, 2.38, 2.68, and 3.1 eV have also been detected in n-type samples and at 1.66, 2.12, 2.69 eV in p-type samples.