The title compound, C20H21N3OS, was prepared by Huisgen reaction of 5-(4-hexyloxyphenyl)tetrazole and chlorobenzothiazole. The essentially planar benzothiazolotriazole framework [maximum deviation from the mean plane of 0.077 (1) Å for the bridgehead N atom] and the phenyl ring form a dihedral angle of 53.34 (5)°. The hexyloxy chain adopts a gauche–all-anti conformation. The intracentroid separation of 3.7258 (8) Å between the triazole and benzene rings is the closest contact between individual molecules in the crystal.