The modification of the properties of II-VI group semiconducting nanomaterials with a high energy ion beam is an imminent field of interest presently. This work presents the impact of energetic (120 MeV) gold (Au9+) ions on electrochemically deposited thin films of cadmium telluride (CdTe). The substrate chosen for the deposition of thin films is indium tin oxide (ITO)-coated glass substrate. To investigate the impact of ions, the films are irradiated with different fluencies of ion beam at Inter University Accelerator Centre, New Delhi, India. The influence of ions on structural, optical, and electrical properties of thin films was studied. The XRD spectra obtained from pristine and irradiated thin films revealed the polycrystalline nature of all films with variations in intensities of some planes. The average crystallite size and lattice strain were also calculated. The absorption spectra revealed a reduction in optical band gap due to irradiation.