Triglycine oxalate single crystal is grown by a slow evaporation technique from the saturated solution at the predetermined temperature. X‐ray diffraction studies of the grown crystal reveal that the grown crystal belongs to a monoclinic structure. The presence of elements and various functional groups of the triglycine oxalate is found in the Fourier transform infrared analysis. Optical transparency of the grown crystals is found to have the maximum transparency in the entire visible region. Thermogravimetric analysis shows that the grown crystals have three stages of decomposition. The microhardness of the grown crystals exhibits that the crystal is a soft material. The electrical studies such as dielectric constant, and dielectric loss are determined for the frequency range from 100 Hz to 200 kHz at different temperatures.