In the title compound, C18H16N2O3S, the dihedral angle between the planes of the benzene ring and the naphthyl ring system is 83.37 (10)°. An intramolecular O—H⋯N hydrogen bond occurs. Intermolecular N—H⋯O hydrogen bonds stabilize the crystal structure. There is a π–π interaction between the naphthyl ring systems [centroid–centroid distance = 3.7556 (15) Å]. In addition, naphthyl–tolyl and naphthyl–naphthyl C—H⋯π interactions are observed
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