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In the title Schiff base compound, C18H13N3O4, prepared by the reaction of 2-hydroxy-1-naphthaldehyde with 2-nitrobenzohydrazide, the dihedral angle between the benzene ring and naphthyl ring system is 23.0 (2)°. There is an intramolecular O—H...N hydrogen bond involving the naphthalene hydroxy substituent and a hydrazide N atom. In the crystal structure, symmetry-related molecules are linked through intermolecular N—H...O hydrogen bonds, forming chains propagating in [101].