Single crystals of Meta nitroaniline (mNA) were grown successfully by slow evaporation technique. The as-grown crystal was clear, transparent and the size of the crystal attained was 8 x 4 x 3 mm3 within a period of 3 weeks. The grown crystals were subjected to single crystal X-ray diffraction analysis to confirm their orthorhombic system. An attempt was made to calculate polarizability by Penn analysis and compare with the traditional method and results are tabulated. The optical properties of the grown crystal were calculated from UV-transmission spectrum analysis. Dielectric constant studies were carried out at different temperatures and frequencies. The second harmonic generation efficiency of the grown crystal was confirmed by Kurtz and Perry powder technique.