Energy importers globally are gradually increasing. The maximum demand is for energy sources, especially for crude products. Biodiesel is eco-friendly and it is derived from vegetable oil, animal fat, waste cooking oil, and nonedible oil. udy, waste cooking oil was used to make biodiesel with the help of a heterogeneous catalyst. Titanium dioxide doped with magnesium molybdate as used as a heterogeneous catalyst to make biodiesel by, the alcohol mixture using the ultrasonication technique at 616 degrees C for 4 h. The catalysts were characterized by X-ray diffraction (XRD), Fourier-transform infrared spectro-scopy (FTIR), scanning electron microscopy (SEM), Thermagravimetric analysis (TGA), and Energy-dispersive X-ray spectroscopy (EDAX) analysis.