In the title compound, C16H14ClNO2S, the phenyl ring makes a dihedral angle of 78.1 (1)° with the indole ring system. The molecular structure is stabilized by weak intramolecular C—H⋯O interactions. The crystal structure exhibits weak intermolecular C—H⋯O, C—H⋯π and π–π [centroid–centroid distances = 3.620 (1)–3.794 (1) Å] interactions