Single crystals of bis-glycinium oxalate (BGLO) were grown from the aqueous solution by slow evaporation growth technique by taking glycine and oxalic acid in the molar ratio 2:1. The lattice parameters of the grown crystal was confirmed by single crystal XRD analysis and crystalline nature was identified by powder X-ray diffraction method. Solubility of the material was gravimetrically analyzed. The presence of functional groups in the grown crystal was identified from FTIR spectral studies. Optical behaviour of the title compound was analyzed by using UV-visible spectrophotometer. The mechanical strength of the grown crystal was found from Vickers microhardness measurement. The thermal behaviour of the grown crystals has been investigated by TG/DTA analysis and the impedance analysis was performed for the sample to understand the electrical properties. SHG test reveals that the grown crystal is a centrosymmetric and third-order NLO material.