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In the title Schiff base compound, C19H16N2O3, the dihedral angle between the mean planes of the benzene ring and the naphthyl ring system is 0.8 (2)°. The mean plane of the hydrazide group forms dihedral angles of 2.0 (2) and 2.2 (2)°, respectively, with the mean planes of the benzene ring and the naphthyl ring system. A strong intramolecular N—H...O hydrogen bond is present. In the crystal, intermolecular O—H...O hydrogen bonds form chains along the c axis and help to provide stability in the crystal packing.