A nonlinear optical single crystal of L-histidinium 2-nitrobenzoate has been grown by slow evaporation method. The grown crystal was subjected to single crystal X-ray diffraction analysis to confirm that the crystal belongs to the monoclinic system. Dielectric studies reveal that both dielectric constant and dielectric loss decreases with increase in frequency at different temperatures. Some fundamental data such as valance electron plasma energy, Penn gap, Fermi energy and electronic polarizability of the grown crystal were calculated.