4-Ethyl-5-(2-hydroxyphenyl)-2H-1,2,4-triazole-3(4H)-thione

In the title compound, C10H11N3OS, an intramolecular C—H⋯S hydrogen bond is observed, which leads to a thione tautomer in the solid state. The benzene ring forms a dihedral angle of 85.33 (6)° with the triazole ring. There are intermolecular N—H⋯S and O—H⋯N hydrogen bonds and C—H⋯π interactions.