Pure and picric acid doped urea succinic acid (USA) crystals were grown from aqueous solution by slow solvent evaporation technique at room temperature. X-ray diffraction studies have confirmed the crystal structure and crystallinity of the grown crystals. Nonlinear optical behavior of pure and picric acid doped USA crystals have been studied for the first time by Kurtz-Perry powder technique. UV-Vis-NIR absorption and transmission spectra were measured and the cut-off wavelength, band gap energy and refractive index of the grown crystals were determined. Micro hardness analysis carried out on the material and the value of Work hardening coefficient (n) and elastic stiffness constant (C11) were calculated. The thermal stability and the trend of decomposition of grown crystals were analyzed by TG/DTA analyses. The dielectric studies were carried and AC conductivity of grown crystals was determined. The vibrational frequencies of various functional groups have been derived from FTIR spectrum.