The mol-ecule of the title compound, C(14)H(9)NO(2)S, is nearly planar, the maximum atomic deviation being 0.081 (2) Å. An intra-molecular O-H⋯N bond generates an S(6) ring motif. In the crystal, inversion-related mol-ecules linked by a pair of weak C-H⋯O hydrogen bonds form a supra-molecular dimer. π-π stacking is observed between the thia-zole and benzene rings of adjacent mol-ecules, the centroid-centroid distance being 3.7679 (9) Å.