In the molecule of the title compound, C13H9Cl2N5O2S, prepared by the reaction of 5‐[(1H‐1,2,4‐triazol‐1‐yl)methyl]‐1,3,4‐oxadiazole‐2‐thiol and 2‐bromo‐1‐(2,4‐dichlorophenyl)ethanone, the 1,3,4‐oxadiazole ring makes dihedral angles of 50.56 (2) and 82.95 (4)°, respectively, with the benzene and triazole rings. Weak intermolecular C—H⋯N hydrogen bonds link the molecules into zigzag chains extending along the b axis.