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The thio­pyran unit of the title mol­ecule, C 17 H 15 ClO 2 S, is in chair form. A crystallographic mirror plane bis­ects the mol­ecule, passing through the O=S and the opposite C=O atoms of the central ring, with statistical disorder of the Cl atom. The geometry around the S atom is tetra­hedral and the carbonyl C is planar. The 4-chloro­phenyl group at the 2 position and the phenyl ring at the 6 position have equatorial orientations. Inter­molecular C—H⋯O and C—H⋯Cl hydrogen bonds are found in the crystal structure. In addition, there is a short O⋯C inter­molecular contact [2.970 (5) Å].

2-r-(4-Chlorophenyl)-6-c-phenyl-3,4,5,6-tetrahydro-2H-thiopyran-4-one 1-oxide