Single crystals of L-alaninium oxalate (LAO), a promising semiorganic nonlinear optical (NLO) material have been successfully grown by slow evaporation technique. The grown crystals have been subjected to powder X-ray diffraction analysis to identify the cell parameters and morphology. The Second Harmonic Generation (SHG) efficiency of the crystal has been determined by the Kurtz test. The hardness studies confirm the normal indentation size effect. The dielectric constant and dielectric loss of the crystal at different temperatures was studied as a function of frequency and the results are discussed.